Market Timing vs. Buy-and-Hold Strategy

December 22 2025
Market Timing vs. Buy-and-Hold Strategy

Introduction to the Core Debate

Investing is a field where intuition often collides with evidence, and two strategies sit at the center of many discussions: market timing and buy-and-hold. Market timing is the practice of attempting to predict future market movements and buying or selling assets based on those forecasts. Buy-and-hold, by contrast, emphasizes ownership of a diversified basket of assets for an extended period, accepting short-term fluctuations as part of the journey toward long-term growth. The choice between these approaches is not merely technical; it is a reflection of risk tolerance, time horizon, costs, tax considerations, and even the investor’s temperament. In practical terms, market timing asks whether a person can outpace the market by choosing the moments to be in or out, while buy-and-hold asks whether a discipline of staying invested over decades will outperform the more active, potentially more volatile path of trying to time entry and exit.

To understand the debate, it is essential to distinguish between clever short-term calls and durable long-run performance. Market timing often relies on signals, indicators, or models that attempt to forecast whether prices will rise or fall in a given window. The challenges are formidable: markets are influenced by a kaleidoscope of factors, including macroeconomic data, corporate earnings, sentiment, policy shifts, geopolitical events, and unforeseen shocks. The signal-to-noise ratio in market timing tends to be low, and the costs of acting on imperfect information can erode returns. Buy-and-hold, while seemingly passive, embodies a different philosophy: it banks on the power of compounding over long horizons and the idea that the market’s overall trajectory tends to rise over time, despite periodic drawdowns. The tension between these approaches has guided countless portfolios, academic studies, and the investing press for decades, with the practical implication that the best choice for many investors may be a nuanced blend rather than an absolute preference.

As an overarching idea, market timing seeks to tilt exposure in response to expected regime changes, momentum trends, or fundamental shifts, whereas buy-and-hold seeks to maintain a steady course, letting time and breadth of exposure do the heavy lifting. The tension arises because attempting to time the market presumes a level of predictive accuracy that is both difficult to verify prospectively and costly to sustain when factoring in fees and taxes. Buy-and-hold, in contrast, invites a discipline that many learners find easier to implement and stick with, even when markets exhibit sharp drawdowns. The real-world choices are rarely binary; most investors consider a spectrum that includes strategic asset allocations, periodic rebalancing, and, in some cases, limited tactical shifts designed to mitigate risk without trying to forecast every turn in the market. The article that follows explores the concepts, evidence, practicalities, and decision-making framework surrounding market timing and buy-and-hold, with attention to how they interact with chance, cost, and human behavior in real-world portfolios.

What Buy-and-Hold Really Means in Practice

The buy-and-hold approach is anchored in the belief that owning high-quality assets in broad, diversified markets over long periods tends to deliver favorable outcomes for investors who can tolerate volatility. In practice, this often means purchasing index funds or exchange-traded funds that represent broad segments of the market and then maintaining those positions for years or decades, rather than attempting to second-guess short-term moves. The logic rests on several pillars: first, that markets are not perfectly efficient in the short run, but over long horizons equity markets have historically tended to rise in nominal terms; second, that time in the market generally beats timing the market for the average investor due to the power of compounding returns; and third, that holding a diversified portfolio reduces idiosyncratic risk associated with any single stock or sector. Buy-and-hold also implies a cognitive ease that many investors crave, reducing the friction of constantly monitoring markets and making frequent decisions that could lead to poorer outcomes under stress or fatigue. The practical implications include choosing a well-diversified mix, selecting low-cost vehicles, and planning for periodic rebalancing to maintain alignment with the target risk posture. This approach emphasizes patience, discipline, and a long memory about how markets behave across different cycles, rather than chasing the momentum of a single quarter or year.

One of the essential advantages claimed for buy-and-hold is the reduction in behavioral errors that traders often commit when trying to time the market. When prices swing, emotions like fear and greed can distort judgment, leading to costly decisions such as selling during declines and buying during rallies that have already advanced. Buy-and-hold seeks to counteract these impulses by removing the need to respond to every bump in the road. It also aligns well with tax-efficient investing in many jurisdictions because long-term capital gains rates are typically lower than short-term rates, and infrequent turnover minimizes taxable events. Yet buy-and-hold is not a guarantee of superior performance in every period. In particular, episodes of extended underperformance can test an investor's resolve and may tempt changes in allocation that contradict the core philosophy. The practical reality is that buy-and-hold requires a robust framework for risk management, clear expectations about the time horizon, and a method for handling inevitable drawdowns in a way that preserves the capital needed to stay invested over time.

Historical Evidence and Research on Market Timing

Historical and academic work on market timing generally points toward substantial difficulties in consistently beating a buy-and-hold benchmark after costs. A large body of research suggests that even sophisticated investors, including professional money managers, struggle to persistently outperform low-cost passive strategies once fees, taxes, and trading costs are taken into account. The fundamental reason is simple: markets are highly competitive ecosystems with numerous participants seeking to forecast the same information, which tends to push prices toward fair values, leaving little persistent alpha for most active tactics. In many periods, a significant portion of the performance advantage claimed by market timers evaporates after transaction costs are accounted for, and the advantage, if it exists, is often transient and depends on timing luck rather than skill. This is not to say that timing never works for some investors in some windows, but the durability and economies of scale of such success are widely questioned in the literature and repeatedly tested across asset classes and market regimes.

Several well-known studies emphasize the difficulty of timing the market consistently. For instance, analyses of serial market timers show that successful forecasts in one cycle are frequently undone by the next, illustrating the instability of predictive signals when viewed across longer horizons. In the realm of equity markets, evidence from large datasets and long time frames indicates that staying invested in broad indices, rather than frequently switching between cash and equities, tends to deliver more reliable outcomes for the typical investor. The evidence is even more persuasive when the costs of trading are high or when taxes erode returns through short-term realizations. While there are exceptions, the broad lesson from historical research is that the average investor who tries to time the market does not outperform the simpler, lower-cost strategy of buying and holding a diversified portfolio and staying committed to it through both bull and bear markets.

It is also important to recognize that market timing is most often framed around short horizons, sometimes driven by momentum signals, macro indicators, or yield curves. The performance of such strategies can be highly sensitive to the chosen parameters and the specific asset class. A momentum tilt might show attractive results during certain trending phases, yet the same signal can underperform during regime changes or choppy markets. The durability question is crucial: if an investor cannot replicate the same success across multiple cycles, the practical value of timing becomes questionable, especially when a high-churn approach compounds costs and tax liabilities. In contrast, the buy-and-hold philosophy gains credibility from its simplicity and longevity, which appear to align with the long-run upward drift that many markets have demonstrated over decades. The historical consensus among many researchers is that the combined force of diversification, low costs, and patience largely delivers outcomes that outpace the typical timing strategy over realistic, real-world horizons.

Nevertheless, there are caveats. Some investors may face constraints that make a purely buy-and-hold approach less feasible, such as severe liquidity needs, the desire to tilt toward certain sectors for regulatory or personal reasons, or the necessity to react to structural changes in markets due to technological disruption or policy shifts. In these cases, a hybrid approach that uses a disciplined framework for risk management and a measured incorporation of forward-looking adjustments can be more appropriate than a passive, hands-off stance. The literature supports a cautious view: while market timing as a universal, regularly executed plan is rarely reliable, a well-constructed, rules-based tactical allocation that acknowledges costs and risk can be compatible with a long-run buy-and-hold objective if the changes are limited in scope and frequency. This nuanced view helps reconcile the appeal of proactive adjustments with the practical reality of cognitive bias and trading friction, offering a path that respects both evidence and individual circumstances.

Behavioral Biases That Drive Market-Timing Attempts

Human beings are not perfectly rational when faced with substantial financial risk, and several well-documented biases tend to push investors toward market timing. Loss aversion, the strong tendency to fear losses more than equal gains, can cause investors to cling to cash during downturns or to abandon exposures that have already recovered, often right after turning points. Overconfidence can inflate the perceived skill of a forecast, leading to repeated attempts to outguess the market despite repeated evidence of limited success. Recency bias makes recent market moves seem more predictive than they actually are, encouraging decisions based on the latest trend rather than a coherent long-run plan. Availability bias, where individuals overweight information that is most salient, can distort judgments during periods of market stress when headlines are sensational, leading to abrupt shifts in allocation that are not aligned with fundamentals. Each of these biases contributes to a tendency to react to near-term price action rather than to follow a steady strategy anchored in risk tolerance and time horizon.

Another influential factor is the comfort derived from a sense of control. Market timing often provides the illusion that the investor is steering the ship, which can be psychologically rewarding. The downside, however, is that the perceived control frequently rests on noisy and unreliable signals, while the true control comes from consistent exposure to the broad market and the discipline to maintain it in the face of turbulence. Additionally, tax sensitivities interact with behavioral impulses; during down markets, the temptation to harvest losses or to hurry into cash to avoid further declines can lead to short-term tax planning decisions that degrade long-run results. A disciplined buy-and-hold strategy can reduce the seductive pull of these impulses by establishing a clear framework for when and how to adjust risk, if at all, and by avoiding the frequent churn that is often the symptomatic cost of attempts at market timing. In this way, behaviorally informed investing supports the case for patience, cost awareness, and a structured approach to risk that accommodates human limitations without surrendering long-run objectives to episodic price swings.

From a practical standpoint, investors who resist the urge to time the market tend to ask questions about how much of their portfolio should be exposed to equities, how to structure risk through diversification, and when to rebalance to preserve intended risk profiles. These questions are not purely academic; they reflect real-world constraints and aspirations, such as saving goals, retirement timelines, and the possibility of liquidity needs that may require drawing down assets at inopportune moments. A well-crafted buy-and-hold framework anticipates these realities by incorporating an appropriate level of diversification across asset classes, geographies, and investment styles, by selecting low-cost vehicles, and by setting expectations for drawdowns that align with the investor’s tolerance. The behavioral perspective thus supports a stable, structured approach that minimizes the impulse to pursue short-term gains at the expense of long-term growth, even though it does not guarantee immunity from market stress or from occasional underperformance relative to more dynamic schemes.

Costs, Taxes, and the Realities of Trading Activity

One of the clearest channels through which market timing can erode returns is the friction created by trading activity. Every time an investor buys or sells based on a forecast, costs such as bid-ask spreads, commissions, and taxes come into play. These costs accumulate over time, particularly for strategies that require frequent adjustments or that attempt to exploit short-lived price inefficiencies. Even when a timing strategy shows a plausible signal, the transaction costs can turn an apparent edge into a loss once the math is done. In addition, taxes can erode after-tax returns, especially for strategies that realize gains in short business cycles. Investors who frequently trade are likely to realize short-term capital gains, which are typically taxed at a higher rate than long-term gains, reducing the net performance of an active timing approach relative to a buy-and-hold strategy that minimizes taxable events by maintaining positions for longer periods.

Billions of dollars of assets move in and out of markets as funds assess signals and reallocate portfolios. The volume of trades induced by market timing can itself have subtle effects on prices, particularly when large investors act in a synchronized fashion. Bid-ask spreads, market impact costs, and the propensity for slippage become meaningful concerns for strategies that rely on precise entry and exit points. In contrast, a buy-and-hold framework emphasizes infrequent trading with an eye toward tax efficiency, enabling the investor to benefit from compounding, dividend reinvestment, and the potential for lower overall turnover costs. The costs argument is a central practical reason many advisors and researchers advocate a route that prioritizes long horizons, broad diversification, and low-cost vehicles, reserving strategic shifts for decisions that are anchored in robust risk management rather than speculative timing.

These cost considerations interact with the design of portfolios in meaningful ways. A buy-and-hold plan may include occasional rebalancing to maintain risk parity or strategic exposure levels, but such adjustments are typically modest and purposeful, avoiding the high-frequency churn that underpins many timing strategies. The recalibration is intended to keep the portfolio aligned with the investor’s stated objectives, rather than chasing short-term trend signals. The net effect is that the costs of a disciplined buy-and-hold program are often predictable and controllable, while the costs of a timing-driven approach are more variable and susceptible to escalation during market stress. For many investors, the economics alone provide a compelling argument to favor a long-term holding posture over a strategy that hinges on predicting daily or weekly moves in asset prices.

Risk, Time Horizon, and the Psychology of Endurance

Risk is not a synonym for volatility alone; it is the probability of not achieving an investor’s objectives within the planned horizon. Buy-and-hold strategies are often justified on the grounds that, over long horizons, the market tends to recover from significant drawdowns and continue its upward drift. This perspective frames risk as a function of time: the longer the horizon, the less the short-term fluctuations matter in the aggregate. For many investors, the critical decision is whether their time horizon aligns with the duration needed to ride out downturns without needing to withdraw funds. When the horizon shortens or financial needs loom sooner, risk tolerance may shift, and a cautious tilt toward bonds or other lower-volatility assets might be warranted. However, the core idea remains that long horizons can smooth the effect of temporary declines and capture the equity premium associated with owning broad markets over time.

Market timing theory often frames risk differently. Proponents argue that by avoiding downturns or by initiating positions only after signals of recovery, investors can reduce exposure to the worst drawdowns and preserve capital for compelling opportunities. The practical challenge is the effectiveness of the timing method: accurate detection of entry points and exit points across numerous cycles is difficult, and even small missteps can lead to meaningful underperformance. When assessing risk, it is important to distinguish between the psychological burden of drawdowns and the mathematical volatility of returns. A well-executed buy-and-hold plan can include a premeditated risk-management layer, such as an appropriate asset allocation, diversification, and a contingency plan for liquidity, which helps maintain a probabilistic path toward the investor’s financial goals even when markets behave erratically. The psychology of endurance—sticking to a plan through uncertainty—often plays an outsized role in the ultimate outcome of long-run investing, potentially more than any single forecast about future price movements.

Hybrid and Tactical Approaches: A Middle Ground

Rather than choosing strictly between timing and buy-and-hold, many investors gravitate toward hybrid and tactical approaches that aim to capture some of the upside of market movements while protecting against large downsides. These strategies often involve establishing a core long-term position with diversified, low-cost investments and then adopting a measured set of tactical tilts designed to respond to broader regime changes rather than daily price fluctuations. A common articulation of this idea is to maintain the core of the portfolio in a broad market index while adding a modest sleeve of more opportunistic exposure that could be increased when indicators align and decreased when risk signals deteriorate. The success of such approaches depends on careful calibration of the tilt size, the thresholds for rebalancing, and the costs associated with more frequent adjustments. The field stresses that even in a hybrid framework, the primary objective should be to preserve capital, maintain liquidity for future needs, and sustain an efficient, scalable process for decision making that does not resemble ad hoc reactions to every market move.

From a practical standpoint, a hybrid strategy can provide a smoother ride for investors who want some responsiveness without surrendering the long-run benefits of broad-market exposure. It is crucial to avoid overfitting signals or chasing performance with a perpetual cycle of changes, which would resemble a more aggressive form of market timing. In many cases, a cautious tactical allocation that uses transparent rules and limited turnover can be implemented with minimal impact on costs while yielding modest but persistent improvements in the worst downside scenarios. The literature on dynamic asset allocation emphasizes that even a small, rules-based adjustment in exposure—when done consistently and with explicit risk controls—can help align portfolio risk with evolving circumstances without destroying the core assumption that long-term equity ownership tends to reward patience. The emphasis remains on discipline, cost containment, and a clear understanding of trade-offs rather than an endless hunt for predictive signals that may fail when they are most needed.

Practical Frameworks: How Investors Decide

A practical framework for evaluating market timing versus buy-and-hold begins with clear goals, an explicit time horizon, and a candid assessment of costs. Investors should quantify how much of their portfolio is available for longer-term exposure to equities and how much needs to be in safer assets to meet near-term obligations. A transparent decision process helps prevent emotional reactions from derailing the plan during episodes of volatility. The framework should also incorporate tax considerations, as tax-efficient placement of assets can significantly influence net outcomes over multi-year horizons. When considering timing elements, it is essential to specify the signal sources, the frequency of checks, and the guardrails that prevent overtrading. The most robust strategies typically separate the decision to move to less risky allocations from the decision to move back into higher-risk exposures, with clear criteria for both directions. This separation reduces the likelihood of trying to time every move and encourages a disciplined approach to risk management that aligns with long-run objectives.

Moreover, it is helpful to design a cost-aware plan that explicitly accounts for trading costs, spreads, and tax implications, and to select vehicle types with strong liquidity and low expense ratios. A well-constructed plan often uses automatic features, such as auto-rebalancing and scheduled contributions, to reduce the cognitive load and keep the implementation faithful to the strategy. The emphasis on automation does not eliminate the need for oversight, but it does reduce the probability that emotional reactions will drive decisions in the heat of market stress. In this way, a balanced framework acknowledges that some level of market responsiveness is acceptable, yet places primary importance on the reliability of long-run outcomes, efficiency of execution, and adherence to a robust risk-control structure.

Case Studies and Real-World Scenarios

Consider a hypothetical investor who adopts a classic buy-and-hold strategy with a diversified portfolio of broad-market equities and a portion of bonds for ballast. Over a multi-decade horizon, this investor experiences several pronounced drawdowns, including a sharp financial crisis and a prolonged period of slower growth. In such a scenario, the buy-and-hold philosophy would argue that, despite the pain of the declines, the eventual recovery and the compounding effect of reinvested dividends would restore and exceed initial capital, provided the investor remains committed and does not withdraw funds during troughs. The strength of this approach lies in simplicity, cost control, and the historical tendency for markets to trend upward over long stretches, which realistically aligns with many retirement and long-term saving goals. On the other hand, a timing-inspired investor might have attempted to avoid some downturns or to capture early rebounds using signals based on macro indicators or momentum. If successful in a few instances, such an investor could reduce peak losses and preserve capital more effectively; however, the same approach often stalls during the next regime shift, leading to missed recoveries and higher average entry costs. The net outcome frequently depends on a sequence of fortunate bets rather than a stable and repeatable skill.

Another scenario involves a market that exhibits extended periods of high volatility with no clear directional trend. A buy-and-hold investor may endure a protracted drawdown, yet the eventual reversion to a rising market could still deliver strong long-run returns once the cycle resolves. A market-timing approach in such a context risks chasing false signals or overreacting to noise, causing unnecessary turnover and elevating costs without delivering commensurate benefits. A hybrid plan could attempt to reduce exposure during the most uncertain phases and reallocate when the trend strengthens, but the success of such a strategy again hinges on the reliability of the signals and the discipline to adhere to the thresholds, even during periods of discouraging performance. Real-world investors are often confronted with these mixed environments, which is why robust risk management, transparent cost accounting, and a clear separation between strategic and tactical decisions are central to any credible plan.

Finally, a case that highlights the tax reality shows that long holding periods often enjoy favorable tax treatment, when available, relative to frequent trading that realizes short-term gains. The tax advantage amplifies the net returns of buy-and-hold strategies, particularly for taxable accounts with high turnover in a rising market. In contrast, timing-based strategies can incur heavier tax burdens or require careful tax planning to offset losses and gains, potentially complicating the portfolio maintenance process. These tax dynamics reinforce the practical appeal of patience and consistency, especially for individual investors managing retirement funds or long-horizon goals where tax efficiency can meaningfully affect outcomes over time.

Tools, Data, and Methodologies in Practice

Investors who are curious about market timing often turn to a suite of tools that include trend indicators, moving averages, breadth metrics, and macro proxies. While these tools can offer some directional insight, their reliability varies across regimes, and none guarantees success. The prudent course is to use such tools as part of a broader framework that emphasizes risk controls, cost discipline, and the primacy of long-run goals. In practice, a market timing toolkit may involve a cautious set of rules for reducing exposure when volatility spikes or when correlations with risk assets rise beyond a predetermined threshold. Importantly, these rules should be predefined, backtested, and, ideally, tested under stress conditions to avoid overfitting. Backtesting can reveal the range of possible outcomes, but it cannot guarantee future results, especially if market dynamics change. For buy-and-hold adherents, the primary data sources are broad-market indices, long-run return streams, dividend growth histories, and the evidence that compounding wealth over time tends to reward persistent ownership. Both schools of thought rely on data, but they differ in how they interpret noise, structure risk, and plan for contingencies in the face of unforeseen events. The integrative approach seeks to borrow the best elements from each perspective while maintaining a disciplined stance toward costs, taxes, and the investor’s ultimate objective.

Risks of Overreaction and the Value of Resilience

One of the most subtle risks in any investment program is the danger of overreacting to short-term moves, which can undermine long-run outcomes. Market timing, by its very nature, invites investors to react not to fundamentals but to momentary price action. If reactions become habitual, the portfolio can drift away from its initial risk posture, and the investor may end up bearing more risk than intended or missing the opportunities provided by long-run growth. The resilience of a buy-and-hold strategy depends on maintaining a consistent risk budget and responsibility toward the plan, even when markets behave violently. Resilience also means having a plan for liquidity needs, for tolerating drawdowns without panic, and for ensuring that the investment horizon remains aligned with life goals. A resilient framework also includes periodic review to adjust for changes in circumstances, such as retirement timelines, income flows, or shifts in personal risk tolerance, but these adjustments should be anchored in a deliberate process rather than in the impulse to react to the latest headline.

Market timing risks include the potential for misinterpretation of data, the tendency to chase momentum near the end of rapid rallies, and the possibility of being caught in a sharp reversal after a well-timed exit. The real-world consequences can be severe: missed compounding, higher tax bills, and the erosion of confidence in one’s ability to manage money. The best defenses against these hazards include keeping costs low, maintaining a diversified core, employing a clear set of rules that govern when to adjust, and ensuring that the expectations for gains from timing are not inflated by hindsight after the fact. In short, resilience comes from structure, not spontaneity, and the most robust investment programs emphasize sustainability and simplicity over clever but brittle strategies that may only appear successful in a subset of historical conditions.

Implementing a Personal Decision: A Step-by-Step Reflection

For an individual considering the market timing versus buy-and-hold decision, a practical starting point is a thorough self-assessment of time horizon, liquidity needs, risk tolerance, and tax considerations. The next step involves selecting an appropriate baseline, such as a diversified, low-cost index portfolio aligned with a long horizon. From there, the investor can decide whether to add a measured tactical overlay that is rules-based and exhibit modest turnover, with explicit cost and risk limits. It is crucial to implement these decisions within a framework that includes regular monitoring, but not constant tinkering, and to set expectations about how much of the portfolio might be used for opportunistic shifts versus passive core exposure. An essential element is the cultivation of financial literacy and awareness about behavioral biases; this awareness helps prevent emotional reactions from steering the portfolio away from its declared plan during periods of stress. A well-conceived personal framework recognizes that the aim is to maximize the likelihood of reaching long-term goals, not to achieve perfect market forecasts in every year or quarter.

Execution also matters: choosing vehicles with low expense ratios, high liquidity, tax efficiency, and robust tracking of the intended benchmarks reduces the risk that the plan’s advantages will be eroded by internal frictions. The decision to hold a broad market exposure for the long haul is supported by the evidence that price appreciation over time tends to dominate the risk that the horizon personified will be cut short by short-run downturns. If an investor chooses to incorporate a tactical overlay, the overlay should be designed to respond to macro regimes rather than daily tick movements, and it should be constrained in magnitude to minimize the risk of style drift or costly misfires. Finally, continuous education and periodic re-evaluation ensure that the chosen path remains aligned with evolving circumstances, market structure, and personal goals, preserving the integrity of the investment plan while allowing for prudent adaptions when warranted by genuine changes in risk or time horizon.

In sum, market timing and buy-and-hold represent two ends of a spectrum rather than mutually exclusive destinies. The most common and durable path for many investors blends the discipline of a long-run buy-and-hold core with a carefully calibrated, rules-based tactical overlay that aims to reduce risk and avoid known traps. The degree of tilt toward timing depends on individual circumstances, including the size of the portfolio, the tax environment, and the investor’s willingness to tolerate periods of underperformance. The key is to keep the costs low, the signals transparent, and the process autonomous enough to resist emotional swings while still providing a coherent framework for adapting to new information. When combined thoughtfully, these elements offer a principled way to navigate the difficult terrain between trying to forecast every move and simply staying the course toward long-term financial objectives.

Ultimately, the market’s long-run trajectory—the central empirical appeal of buy-and-hold—has persisted across many generations and cycles. The willingness to stay invested, to accept volatility as a cost of access to higher expected returns, and to manage risk with diversification and discipline forms the backbone of a prudent investing practice. Market timing, if pursued at all, should be constrained by explicit costs, robust risk controls, and a candid appreciation of the odds. The nuanced view presented here suggests that the most resilient investor posture blends patience, low friction, and a disciplined approach to occasional, well-signaled adjustments, rather than a relentless chase for optimal timing. In that sense, the enduring wisdom is not a single rule but a philosophy: invest for the long term, respect costs, and stay true to a plan that aligns with your goals, your time horizon, and your capacity for enduring the inevitable volatility that accompanies every prudent attempt to grow wealth through the market. This philosophy embodies the practical art of balancing timing awareness with the unassailable logic of buy-and-hold, producing outcomes that reflect both the mind’s discipline and the market’s enduring trend toward growth.