北京大学：《中级微观经济学》课程教学资源（PPT课件讲稿，英文版）Chapter Twenty-Three 行业供给 Industry Supply

Chapter Twenty-Three Industry Supply 行业供给

Chapter Twenty-Three Industry Supply 行业供给

Structure Market supply Short-run supply and equilibrium Long-run supply and equilibrium Long-run implications for taxation Fixed inputs and economic rent(经济 租金)

Structure Market supply Short-run supply and equilibrium Long-run supply and equilibrium Long-run implications for taxation Fixed inputs and economic rent (经济 租金)

Supply From A Competitive Industry How are the supply decisions of the many individual firms in a competitive industry to be combined to discover the market supply curve for the entire industry?

Supply From A Competitive Industry How are the supply decisions of the many individual firms in a competitive industry to be combined to discover the market supply curve for the entire industry?

Supply From A Competitive Industry Since every firm in the industry is a price-taker, total quantity supplied at a given price is the sum of quantities supplied at that price by the individual firms

Supply From A Competitive Industry Since every firm in the industry is a price-taker, total quantity supplied at a given price is the sum of quantities supplied at that price by the individual firms

Short-Run Supply In a short-run the number of firms in the industry is, temporarily, fixed Let n be the number of firms 1=1, s (p)is firm is supply function

Short-Run Supply In a short-run the number of firms in the industry is, temporarily, fixed. Let n be the number of firms; i = 1, … ,n. Si (p) is firm i’s supply function

Short-Run Supply In a short-run the number of firms in the industry is, temporarily, fixed Let n be the number of firms 1=1, S (p)is firm i's supply function The industry's short-run supply function is S(p)=∑S;(p) i=1

Short-Run Supply In a short-run the number of firms in the industry is, temporarily, fixed. Let n be the number of firms; i = 1, … ,n. Si (p) is firm i’s supply function. The industry’s short-run supply function is S p Si p i n ( ) =  ( ). =1

Supply From A Competitive Industry Firm 1s Supply Firm 2's Supply S,p s2(p)

Supply From A Competitive Industry p S1 (p) p S2 (p) Firm 1’s Supply Firm 2’s Supply

Supply From A Competitive Industry Firm 1s Supply Firm 2's Supply S1(p) S,p s2(p) p S1p) s(p)=S1(p)+S2(p) Industry' s Supply

Supply From A Competitive Industry p S1 (p) p S2 (p) p p’ p’ S1 (p’) S1 (p’) Firm 1’s Supply Firm 2’s Supply S(p) = S1 (p) + S2 (p) Industry’s Supply

Supply From A Competitive Industry Firm 1s Supply Firm 2's Supply p S1(p) S,p) s2(p”)s2(p) p p s(p”)+S2(p”) s(p)=S1(p)+S2(p) Industry' s Supply

Supply From A Competitive Industry p S1 (p) p S2 (p) p S(p) = S1 (p) + S2 (p) p” p” S1 (p”) S1 (p”)+S2 (p”) S2 (p”) Firm 1’s Supply Firm 2’s Supply Industry’s Supply

Supply From A Competitive Industry Firm 1s Supply Firm 2's Supply S,p s2(p) p s(p)=S1(p)+S2(p) Industry' s Supply

Supply From A Competitive Industry p S1 (p) p S2 (p) p Firm 1’s Supply Firm 2’s Supply S(p) = S1 (p) + S2 (p) Industry’s Supply