Diversification vs. the Siren's Song

25 years ago I wrote a book called “Navigate the Noise” that posited people have difficulty building wealth because they often follow a Sirens’ Song of high-returning yet “riskless” assets instead of following time-tested wealth-building principles. Continuing the Greek mythology theme, investors’ portfolios that steer toward the hauntingly attractive story of “riskless” high-returning assets eventually “crash on the rocks."

The Sirens’ have been singing loudly and investors are again refusing to follow sound wealth-building strategies, like diversification. Many investors today believe diversification has become “diWORSEsification”. They question the purpose to diversification when all one needed to do was trade a small group of surging stocks, i.e., the Sirens’ luring combination of high returns with no risk. Buying other assets, they felt, just added risk to a portfolio and hindered performance.

Perhaps the best example of portfolios being steered off-course is the beta of private client portfolios. At the end of January, private client investors’ largest stock holdings had an aggregate beta of an absolutely mind-boggling 1.7 (1.0 implies risk equal to the overall equity market’s risk within the context of a well-diversified portfolio). As Chart 1 highlights, that beta decreased as market volatility picked up, but investors nonetheless have started to increase portfolio beta again.

Top 10 GWIM

Such fervor has historically been a sign that future returns might be subpar. For example, it took NASDAQ more than a decade simply to break even after the peak of the Technology Bubble in March 2000 despite widespread adoption of the internet over that period (see Chart 2).

Nasdaq composite