Correlation
Correlation measures, between −1 and +1, how far two assets move together. Near +1 they rise and fall in step; near −1 they offset each other; near 0 they are independent. It is the basis of diversification, with one important caveat: in a crisis correlations tend to shoot towards 1, precisely when you most needed them not to.
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Definition for informational purposes. It is not financial advice nor a recommendation to buy or sell.