To sell short a listed stock in a margin account requires a deposit of: A. 25% of the price of the transaction B. 50% of the price of the transaction C. 25% of the closing price of the security that day D. 50% of the closing price of the security that day

White truffles are a very prized and rare edible fungus that grow naturally in the countryside near alba, italy. suppose that it costs $200 per day to search for white truffles. on an average day, the total number of white truffles (t) found in alba is t = 20x − x 2 , where x is the number of people searching for white truffles on that day. white truffles can be sold for $100 each. if there is no regulation, how many more people will be searching for white truffles than the socially optimal number?