# Question

Consider an economy with two types of firms, S and I. S firms all move together. I firms move independently. For both types of firms, there is a 60% probability that the firms will have a 15% return and a 40% probability that the firms will have a – 10% return. What is the volatility (standard deviation) of a portfolio that consists of an equal investment in 20 firms of

(a) Type S,

(b) Type I?

(a) Type S,

(b) Type I?

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