問題集1
Problem Set 1

• 第1章: 1.2, 1.4, 1.6, 1.8 和 1.10
  Chapter 1: 1.2, 1.4, 1.6, 1.8 and 1.10
  
• 第2章: 2.2, 2.4 和2.6
  Chapter 2: 2.2, 2.4 and 2.6
  
• 第3章: 3.2 和 3.4
  Chapter 3: 3.2 and 3.4

問題集3
Problem Set 3

• 第7章: 7.2, 7.4 和7.6
  Chapter 7: 7.2, 7.4 and7.6
• 第8章: 8.2, 8.4, 和 8.6
  Chapter 8: 8.2, 8.4, and 8.6
• 下一個練習的目的是說明理論並不局限於商品的選擇，並且給予了一個很好的結果。
  The purpose of the next exercise is to illustrate that the theory is not limited to choices over goods, and to show you a very nice result.
  
  考慮一個物種（動物，昆蟲，魚等等），時間是不連續的，因此每個時期都有新一代。每個生物的目標都是最大化其後代的數量。社會中的家庭架構並不清楚（如果可以這麼說的話），可以是單配偶制，也可以是多配偶制等，但必須是雌雄結合產生後代。證明費雪定律︰人口中雌雄的比例應當為50/50。
  Consider a species (an animal, an insect, a fish, e.g.). The time is discrete, so that each period a new generation lives. The objective of each organism is to maximize its descendants. The family structure in a society (if it can be called like that) is not known, it may be monogamy, polygamy, anything that one can imagine, but it does take exactly one male and one female organism to produce offspring. Prove that Fisher's law holds: the ratio of male and female organisms in the population has to be equal 50/50.
  
  提示︰在極大化後代數量的目標下，考慮母親選擇生一個兒子或女兒，她較願意做哪種選擇。考慮孫子。
  Hint: Think about a choice of the mother to have a son or a daughter. Which one she would prefer having in mind the objective above. Think about grandchildren.

問題集5
Problem Set 5

• 第9章: 9.8 和 9.10
  Chapter 9: 9.8 and 9.10
• 第10章: 10.2
  Chapter 10: 10.2

問題集7
Problem Set 7

• 第15章: 15.4 和 15.6
  Chapter 15: 15.4 and 15.6
• 第 16章: 16.4, 16.10 和 16.12
  Chapter 16: 16.4, 16.10 and 16.12