Welcome to the next instalment in our series of evidence-based investment insights; Factors that figure in your evidence-based portfolio. To check out the rest of the series, click here.
In our last piece, The essence of evidence-based investing, we explored what we mean by ‘evidence-based investing’. Grounding your investment strategy in rational methodology strengthens your ability to stay on course toward your financial goals, as we:
1. Assess existing factors’ capacities to offer expected returns and diversification benefits
2. Understand why such factors exist, so we can most effectively apply them
3. Explore additional factors that may complement our structured approach
Assessing the Evidence (so far)
An accumulation of studies dating back to the 1950s through today has identified three stock market factors that have formed the backbone for evidence-based portfolio construction over the long run:
1. The equity premium – Stocks (equities) have returned more than bonds (fixed income), as we described in The business of investing
2. The small-cap premium – Small-company stocks have returned more than large-company stocks. (Although recent analysis suggests this factor may require additional dissection to isolate its essential premium.)
3. The value premium – Value companies (with lower ratios between their stock price and various business metrics such as company earnings, sales and/or cash flow) have returned more than growth companies (with higher such ratios). These are stocks that, based on the empirical evidence, appear to be either undervalued or more fairly valued by the market, compared with their growth stock counterparts.
This is the trio of factors described in the Fama-French Three-Factor Model we discussed in The essence of evidence-based investing. Similarly, academic inquiry has identified two primary factors driving fixed income (bond) returns:
1. Term premium – Bonds with distant maturities or due dates have returned more than bonds that come due quickly
2. Credit premium – Bonds with lower credit ratings (such as ‘junk’ bonds) have returned more than bonds with higher credit ratings
Understanding the evidence
Scholars and practitioners alike strive to determine not only that various return factors exist, but why they exist. This helps us determine whether a factor is likely to persist (so we can build it into a long-term portfolio) or is more likely to disappear upon discovery.
Explanations for why persistent factors linger usually fall into two broad categories: risk-related and/or behavioural.
A tale of risks and expected rewards
It appears that persistent premium returns are often explained by accepting market-related risks (the kind that cannot be diversified away) in exchange for expected reward.
For example, it’s presumed that value stocks are riskier than growth stocks. In Value Premium Lives! financial author Larry Swedroe explains: “Among the risk-based explanations for the premium are that value stocks contain a distress (default) factor, have more irreversible capital, have higher volatility of earnings and dividends, are much riskier than growth stocks in bad economic times, have higher uncertainty of cash flow, and … are more sensitive to bad economic news.”
A tale of behavioural instincts
There may also be behavioural foibles at play. That is, our basic-survival instincts often play against otherwise well-reasoned financial decisions. As such, the market may favour those who are better at overcoming their impulsive, often damaging gut reactions to breaking news. Once we complete our exploration of market return factors, we’ll explore the fascinating field of behavioural finance in more detail, as this ‘human factor’ contributes significantly to your ultimate success or failure as an evidence-based investor.
Your take-home
Factors that figure into market returns may be a result of taking on added risk, avoiding the self-inflicted wounds of behavioural temptations, or a mix of both. Regardless, existing and unfolding inquiry on market return factors continues to hone our strategies for most effectively capturing expected returns according to your personal goals. The same inquiry continues to identify other promising factors that may help us augment our already strong, evidence-based approach to investing. We will turn to these next.
Continue exploring the rest of the evidence-based investment insights here.
