身边的经济学·社会常识英语30篇（2）
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Diversification and the Illusion of Correlation
分散投资与相关性直觉误区
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Investors often assume assets from different countries or sectors move independently.
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But during global crises, correlations between stocks, bonds, and commodities can spike suddenly.
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This undermines diversification’s risk-reduction promise when it matters most.
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Historical averages mislead if future conditions differ structurally from past ones.
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Adding real estate or infrastructure may help only if their cash flows truly differ.
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Behavioral finance shows people underestimate how much markets sync up under stress.
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True diversification requires analyzing underlying drivers—not just labels like 'emerging' or 'tech'.
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Rebalancing portfolios annually helps maintain target risk exposure despite shifting correlations.
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Stress-testing models now incorporate tail-risk scenarios to expose hidden linkages.
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Smart diversification means expecting correlation surprises—not ignoring them.