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Correlation
Risk Management
是什么意思
How much two assets move together, from -1 (opposite) to +1 (identical). 0 means no relationship. It decides whether diversification is real.
举例
Two tech stocks might have +0.85 correlation -- they usually rise and fall together, so holding both barely reduces risk. A tech stock and gold might be near 0, giving real diversification.
新手常犯的错
Beginners assume "different tickers = diversified." In a crash, correlations jump toward 1 and everything falls together; true diversification needs assets that are uncorrelated in bad times.
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