2.7 Stock Strategies and Risk-Adjusted Performance
Key Takeaways
Value, growth, small-company, contrarian, and timing approaches expose retirees to different risks.
Sharpe uses total standard deviation; Treynor uses benchmark beta.
Time-weighted and money-weighted returns answer different questions about management and investor experience.
Comparing strategies on a common basis
Retirement investors need to know how a proposed strategy earns returns, what risks it accepts, and how its results will be judged. A stock strategy is not appropriate merely because it recently outperformed. Compare it with a suitable benchmark over a meaningful period, after costs and with the client's withdrawals in view.
Buy-and-hold maintains ownership through changing markets. A passive index portfolio usually follows a specified index rather than select individual winners. Passive investing reduces some manager-selection and trading decisions, but still exposes the household to the index's concentration and market risk. Rebalancing or making withdrawals does not necessarily abandon a long-term investment policy.
Active stock-selection styles
Value investing seeks companies priced attractively relative to earnings, assets, or cash flow. A low price-to-earnings ratio can reflect opportunity or a deteriorating business. A counselor must distinguish valuation from certainty of recovery. Growth investing emphasizes expected expansion in earnings or revenue. Paying a high price for expected growth can create substantial losses if the expectations are not met.
Small-company investing targets smaller market capitalizations. Potential return can come with less liquidity, greater business concentration, and sensitivity to financing conditions. Small-company exposure is not an appropriate substitute for the cash reserve needed next month. Contrarian investing takes positions against prevailing sentiment; it needs a valuation and risk rationale, rather than the rule that an unpopular asset must rebound.
Market timing changes exposure based on forecasts or signals. It involves both leaving and reentering the market, and introduces trading, tax, and implementation risks. A tactical allocation can allow bounded temporary changes, while a strategic policy defines the long-term mix. The existence of a tactical framework does not prove forecasting skill or justify unlimited deviations.
| Approach | Main decision | Retirement risk to inspect |
|---|---|---|
| Passive buy-and-hold | Which index and allocation to hold | Market losses and benchmark concentration |
| Value | Whether price understates fundamentals | A cheap company can remain impaired |
| Growth | Whether future expansion supports price | Valuation sensitivity and disappointment |
| Small company | Whether smaller-firm exposure fits | Liquidity and business-cycle risk |
| Contrarian | Whether consensus misprices an asset | Being early or simply wrong |
| Timing/tactical | When to alter exposure | Reentry, costs, taxes, and policy drift |
Total risk and market sensitivity
Standard deviation measures dispersion of returns around their average over the measured period. It treats upside and downside variation as dispersion. Beta measures sensitivity to a selected market benchmark. Beta of 1.2 does not mean a guaranteed 20% return; it describes estimated co-movement. A concentrated portfolio can have modest beta but substantial company-specific risk.
Diversification can reduce company-specific risk, but many holdings in the same sector can remain highly correlated. The number of fund names is not a diversification test if every fund owns similar securities. Examine exposure by sector, geography, maturity, issuer, and economic driver.
Risk-adjusted measures
The Sharpe ratio divides return above a risk-free reference by total return standard deviation. Using consistent annual figures, a portfolio returning 8%, a 3% risk-free reference, and 10% standard deviation has a Sharpe ratio of (8% - 3%) / 10% = 0.50. Another returning 9% with 15% standard deviation has (9% - 3%) / 15% = 0.40. The first has the higher measured excess return per unit of total volatility despite the lower raw return.
The Treynor ratio instead divides excess return by beta. It is useful when systematic risk is the intended comparison and the portfolio is sufficiently diversified. It does not capture all risk in a concentrated account. Alpha describes return beyond that predicted by a specified risk model; changing the model or benchmark can change the apparent alpha.
These measures use estimates. Period selection, stale pricing, leverage, negative excess returns, and a mismatched risk-free rate can undermine comparisons. A high historical ratio is not an entitlement to future income. Always compare like periods and consistent return definitions.
Returns when a client contributes or withdraws
A time-weighted return links subperiod returns while reducing the effect of external cash-flow timing, making it useful for assessing investment management. A money-weighted return, commonly an internal rate of return, reflects the investor's actual cash-flow timing and size. Large withdrawals before a recovery can make personal experience differ from the manager's time-weighted result.
For retirement counseling, both perspectives matter. Assess the investment process using an appropriate benchmark, then test whether actual withdrawals and taxes leave the client funded. A manager can outperform a benchmark while the household still spends too much. Conversely, a short period of underperformance does not automatically justify abandoning a strategy that fits the documented policy.
Applied decision
Suppose a new retiree wants to replace investment-grade bonds with a small-cap growth fund because its last year's return was higher. The appropriate response examines the purpose of the bond sleeve, the next spending dates, the equity risk added, tax costs, and the benchmark. Comparing recent raw returns alone ignores the liability the bonds were intended to fund.
Checked October 19, 2026: SEC investment-risk guidance.
A portfolio returns 8%, the risk-free reference is 3%, and standard deviation is 10%. What is its Sharpe ratio?
0.80
1.60
0.30
0.50
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