Agrand jury was investigating a bank robbery. the only information known to the prosecutor was a rumor that a certain ex-convict might have been involved. the grand jury subpoenaed the ex-convict. he refused to answer questions about the robbery and was granted use and derivative use immunity. he then testified that he and a friend had robbed the bank. the grand jury indicted both the ex-convict and his friend for the bank robbery. the prosecutor permitted the friend to enter a plea to a lesser offense in exchange for the friend’s agreement to testify against the ex-convict. the prosecutor had no evidence as to the identity of the robbers except the testimony of the friend and the ex-convict. at the ex-convict’s trial, should his objection to his friend’s being permitted to testify be sustained?

Susie buys two goods - rounds of golf and massages. suppose that the price of a round of golf is $20, and the price of a massage is $30. in a typical week susie will play two rounds of golf, getting 20 units of satisfaction from the second round. she normally buys three massages each week, with the third giving her 30 units of satisfaction. if she were to buy a fourth massage in a week, it would give her 20 units of satisfaction. if the price of massages is reduced to $15, which of the following outcomes might we expect to occur? a) susie would leave her consumption choices unchanged because of diminishing marginal utility in the consumption of massages. b) susie would buy more massages and more rounds of golf, as predicted by the substituion effect. c) susie would buy more massages and fewer rounds of golf, as predicted by the substitution effect. d) susie would buy more massage and fewer rounds of golf, as predicted by income effect.