Amy is thinking about going to the movies tonight. A movie ticket costs $15, and she’ll have to cancel a $20 dog-sitting job that she would have been willing to do for free. The opportunity to Amy cos
单选题
Amy is thinking about going to the movies tonight. A movie ticket costs $15, and she’ll have to cancel a $20 dog-sitting job that she would have been willing to do for free. The opportunity to Amy cos