Jones, who has a federal personal income tax rate of 28 percent, holds an oil stock that appre- ciates in value by 10 percent each year. He bought the stock one year ago. Jones's stockbroker now wants him to switch the oil stock for a gold stock that is equally risky. Jones has decided that if he holds on to the oil stock, he will keep it only one more year and then sell it. If he sells the oil stock now, he will invest all the (after-tax) proceeds of the sale in the gold stock and then sell the gold stock one year from now. What is the minimum rate of return the gold stock must pay for Jones to make the switch? Relate your answer to the lock-in effect.

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