Something unusual happened in 2022: stocks and bonds fell at the same time. For decades, the 60/40 stock/bond portfolio had been the bedrock of conventional diversification, with equities for growth and fixed income as ballast. But a foundational assumption was exposed when both declined together. Four years later, too few investors have absorbed that lesson.
The True Meaning of Diversification
Diversification, properly understood, is not about the number of holdings on a statement; it is about owning assets that react differently to the same economic event. A portfolio is diversified when a shock that hurts one position is cushioned, or offset, by another that behaves, at least in part, independently. By that measure, many investors who believe they are well diversified are carrying far more concentrated risk than they realize.
How Concentration Creeps In
Consider how a typical Canadian portfolio comes together. An investor starts with a Canadian equity fund for domestic exposure. The S&P/TSX composite index is dominated by financials, energy and materials, three sectors that routinely account for more than 60 per cent of the index and are all sensitive to similar forces: interest rates, commodity prices and the domestic economic cycle. From the very first building block, the portfolio is concentrated.
The natural response is to diversify internationally, usually by adding a global or United States exchange-traded fund. But many broad global equity indexes are now dominated by a small number of U.S. megacap technology companies, with the largest five or six names representing more than 20 per cent of the index. The investor has traded one concentration for another. Worse, holding both a U.S. equity fund and a separate global fund may result in substantial overlap between the pair — two products with similar compositions and risk profiles.
The Balanced Fund Trap
A balanced fund is often the final layer, meant to smooth returns by blending equities and fixed income. Many of Canada’s largest balanced funds carry equity weightings of 60 per cent to 70 per cent, with a pronounced home bias toward domestic equities, according to data from Morningstar Inc. Rather than offsetting the concentrations already in the portfolio, the balanced fund reinforces them, adding another dose of the same financial- and resource-sector exposure the investor already owns.
At every step, the investor seems to have made a reasonable choice. But each solution has introduced a new form of the very problem it was meant to solve. The result is a portfolio that looks diversified on paper, but behaves as if it holds far fewer positions than it does.
Breaking the Illusion
Breaking the illusion starts with looking beneath the label. Examine the actual sector, geographic and factor exposures within each fund. Read the prospectus or detailed fund reports, not just the name or category. The goal is to think in terms of risk exposures rather than asset labels. A Canadian bank stock and a balanced fund with heavy financial-sector weighting are not meaningfully different sources of risk. Until investors learn to ask that question and demand clear answers, the illusion of diversification will remain one of the most persistent and least examined risks in portfolio management.
