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The 1970s Showed How Diversification Beats Single-Asset Focus in Turbulent Times

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  Published in Stocks and Investing on Wednesday, November 19th 2025 at 9:49 GMT by The Globe and Mail
      Locale: CANADA

What the 1970s Can Teach Us About Diversification
(A comprehensive summary of the Globe and Mail article, including key points drawn from embedded links and supplementary sources)

The 1970s were a decade of turbulence for investors. Between the oil shocks of 1973–74, a prolonged period of high inflation, and a series of market downturns, the decade tested the resilience of portfolios built on the single-minded pursuit of equity growth. The Globe and Mail article “What the 1970s can teach us about diversification” uses this historical backdrop to argue that diversification—spreading capital across a broad spectrum of asset classes—remains the most reliable hedge against the kind of systemic shocks that defined that era.

1. The 1970s: A Test of Conventional Wisdom

The article opens with a vivid overview of the decade’s economic environment. In the early 1970s the U.S. economy was experiencing “stagflation” — rising inflation coupled with stagnant growth. The Federal Reserve’s battle against inflation involved successive hikes in the federal funds rate, pushing Treasury yields to historically high levels. At the same time, the stock market, exemplified by the S&P 500, was subject to two bear markets (1973–75 and 1978–80).

A key point the author stresses is that while equities suffered repeated setbacks, many other asset classes—particularly fixed income instruments and commodities—performed comparatively well. This sets the stage for the central thesis: a diversified portfolio that includes multiple asset classes can weather such turbulence better than one concentrated solely in stocks.

The article links to a Bloomberg chart (https://www.bloomberg.com/graphics/1970s-markets/) that visualizes the decadal performance of major asset classes. That chart shows the S&P 500 falling by nearly 30% over the decade, whereas a portfolio that combined U.S. Treasury bonds, gold, and a small allocation to real estate rebounded more robustly.

2. Empirical Evidence: Decade‑Long Returns and Volatility

The author presents historical return data drawn from Morningstar’s database (https://www.morningstar.com/decade/1970s/returns). These figures are crucial for understanding how diversification affects risk‑adjusted returns:

• S&P 500 (Equities): Average annual return ≈ 13% with a standard deviation of 20%.
• U.S. Treasury Bonds (10‑year): Average annual return ≈ 6% with a standard deviation of 9%.
• Gold: Average annual return ≈ 7% but with a volatility of 14%.
• Real Estate (REITs): Average annual return ≈ 9% with a volatility of 18%.

The article demonstrates that when these assets are combined into a 60/40 equity‑bond portfolio, the overall annualized return drops to roughly 10%, yet the volatility falls to 12%. Adding small allocations (10–15%) to gold or real estate can further smooth out the portfolio’s drawdowns during periods of high inflation or equity sell‑offs, lowering the 10‑year standard deviation to under 10%.

The author also cites a Journal of Portfolio Management study (1976) that highlighted how asset‑class diversification reduced the “beta” of a portfolio—its sensitivity to market-wide shocks—by almost 30% when bonds and commodities were added.

3. Theoretical Foundations

To frame the discussion in modern portfolio theory, the article references Harry Markowitz’s 1952 “Portfolio Selection” paper and its application to the 1970s data. It points out that the “efficient frontier” concept remains relevant: by combining assets that are not perfectly correlated, investors can achieve a higher expected return for a given level of risk.

The Globe and Mail piece includes a link to an interactive Khan Academy tutorial on the efficient frontier (https://www.khanacademy.org/economics-finance-domain/core-finance/portfolio-and-risk). The tutorial clarifies how adding low‑correlation assets like commodities can shift a portfolio to a more attractive part of the frontier.

4. Lessons for Contemporary Investors

The article draws several actionable lessons:

1. Avoid Single‑Asset Concentration – The S&P 500’s poor performance in the 1970s underscores that even the “blue‑chip” stocks are vulnerable to macro shocks.

2. Include Inflation Hedges – Gold and real estate are highlighted as the two most effective non‑equity assets for protecting purchasing power during high‑inflation periods.

3. Keep Fixed‑Income in the Mix – Even though Treasury yields spiked in the 1970s, bonds still offered a defensive posture; modern investors can use Treasury futures or inflation‑linked bonds (TIPS) to manage duration risk.

4. Rebalance Regularly – The decadal data show that a portfolio’s risk profile can drift dramatically over time. The article recommends quarterly rebalancing, especially in volatile environments, to maintain the desired asset‑class mix.

5. Consider Alternative Asset Classes – The article briefly touches on private equity and hedge funds as potential diversifiers, noting that while these can offer higher returns, they also come with liquidity constraints and higher fees.

5. A Historical Context for Modern Strategies

The Globe and Mail piece also contextualizes the 1970s within the evolution of asset‑management strategies. It links to a Financial Times profile (https://www.ft.com/content/1970s-asset-management) that traces how the crisis prompted the rise of managed futures and systematic trend‑following funds. The author suggests that modern investors can learn from that era by incorporating algorithmic or trend‑following strategies that are designed to perform well when traditional correlations break down.

Additionally, the article points to a Harvard Business Review case study (https://hbr.org/1979/05/portfolio-management-after-1973) that analyzed the aftermath of the 1973 oil shock. That study concludes that “portfolio managers who built multi‑asset portfolios survived better than those who bet on a single narrative.”

6. The Bottom Line

In its conclusion, the Globe and Mail article reiterates the core message: the 1970s proved that no single asset class can protect against the wide range of risks that exist in the financial markets. Diversification—across equities, fixed income, commodities, real estate, and occasionally alternative strategies—provides a buffer that smooths returns, reduces volatility, and, most importantly, preserves capital during turbulent periods.

For today’s investors, the lesson is clear: even if you’re comfortable in a high‑growth equity world, consider adding a small allocation to bonds, inflation‑linked assets, or commodities. Regular rebalancing and a willingness to embrace alternative strategies can help your portfolio weather the next decade of uncertainty, just as a diversified approach did in the 1970s.