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If you wanted to calculate the variance of a 50 stock portfolio (or its square root, the standard deviation), you would need to know three

If you wanted to calculate the variance of a 50 stock portfolio (or its square root, the standard deviation), you would need to know three pieces of information about the stocks.

A: What are those three things?

B: Which of the three can YOU control & change?

C: Which of them produces the risk-reducing diversification effect?

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