Use the concept of marginal utility to explain the following:
Usethe concept of marginal utility to explain the following: Newspaper vendingmachines are designed so that once you have paid for one paper, you could takemore than one paper at a time. But soda vending machines, once you have paidfor one soda, dispense only one soda at a time.
用边界效应的知识解答：报纸贩卖机,买一份,你可以免费多领一份；但是苏打水你付了一听的钱,就只能获得一听