Economics for Today 7th Edition by Irvin Tucker

Exercise 3

This week you have gone to two parties. Assume the total utility you gained from these parties is 100 utils. Then you go to a third party, and your total utility rises to 110 utils. What is the marginal utility of the third party attended per week? Given the law of diminishing marginal utility, what will happen to total utility and marginal utility when you go to a fourth party this week?