How to Evaluate Your Investment Decisions
How to Evaluate Investment Decisions
Understanding Decision vs. Outcome
- Evaluating an investment decision should not be based solely on its outcome; a good outcome does not necessarily indicate a good decision.
- The illusion of control bias leads investors to overestimate their influence on outcomes, which can be detrimental in investing.
- Recognizing the difference between a bad decision and a bad outcome helps maintain a long-term investment strategy despite short-term results.
Risk Assessment in Investing
- Every investment decision involves risk; understanding the risks taken and expected outcomes is crucial for future evaluation.
- Investing in index funds entails market risk, which has an associated risk premium that investors expect to earn over time.
Historical Context of Market Returns
- Historically, the global market has delivered an average risk premium of 4.2% since 1900, despite significant downturns in specific markets like Russia and China.
- Even over ten-year periods, stocks have underperformed compared to safer assets like bills at times, indicating potential for negative outcomes even with sound decisions.
Case Studies: Retirement Outcomes
- Retirees from different years (1973 vs. 1975) experienced vastly different wealth outcomes despite making similar investment decisions due to market uncertainties.
- Long-term trends show that small-cap and value stocks typically yield reliable risk premiums but can also lead to poor short-term performance.
Value Stocks Performance Analysis
- Despite historical outperformance of value stocks over growth stocks, recent trends show value trailing growth by 3.2% annually for the past decade.
- Sticking with an investment strategy is essential; for instance, investing in value stocks required enduring two decades of underperformance before yielding positive returns.
Challenges with Individual Stock Investments
- Picking individual stocks is generally less reliable than broader strategies; most market returns come from a few successful stocks.
Understanding Investment Strategies and Outcomes
Evaluating Active Funds
- A good outcome for an active fund does not necessarily indicate it is a good fund.
- Standard and Poor's Persistence Scorecard shows that only 2.33% of top quartile U.S. active mutual funds remained in the top quartile after five years.
The Challenge of Investment Decisions
- Evaluating investment decisions is complex; relying on persistent risk premiums over an investment lifetime is advisable.
- Luck plays a significant role in outcomes, where bad luck can lead to poor results despite sound decision-making.
Importance of Diversification
- Diversification helps mitigate the impact of luck on investment outcomes by spreading risk across various markets and assets.
- Historical data shows that while U.S. stocks underperformed from 1999 to 2009, Canadian stocks yielded positive returns during the same period, highlighting diversification benefits.
Risk Premium Analysis
- Risk premiums are not perfectly correlated; when one fails, another may succeed, making diversification across risk factors beneficial for investors.
- For instance, U.S. small cap value stocks performed well even when overall U.S. stocks lost value over the last decade (6.45% annual return).
Bayesian Thinking in Investment Decisions
- Bayesian thinking emphasizes starting with prior assessments; strong priors require substantial new evidence to alter one's viewpoint significantly.
- Investors often overweight new information due to cognitive biases like the availability heuristic; thus, it's crucial to evaluate new data against established beliefs before making changes to strategies.
Quality Over Outcome in Decision-Making
- Investment decisions should be judged based on the quality of the process rather than their outcomes since luck can influence results regardless of decision quality.