Question: Consider the one-period binomial example studied in Class 17 to find the price of the up and down securities. At time t=0 the stock

Consider the one-period binomial example studied in Class 17 to find the price of the up and down securities. At time t=0 the stock price is equal to So. At time 1 is either goes up or down. If it goes up, its price is St=ux So, and if it goes down its price is S d x So, where d < u. Let r denote the interest rate. = (a) Use a no arbitrage argument to show that u > 1+r> d. (b) Use the replicating portfolio approach to find the price of the down security shown in the slides.

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