1. Competitive Diversity

2. How can cost functions differ?

3. Competitive Diversity How can cost functions differ? Economic and Accounting Profits

4. Competitive Diversity How can cost functions differ? Economic and Accounting Profits Taxing a Competitive Industry

5. Competitive Diversity How can cost functions differ? Economic and Accounting Profits Taxing a Competitive Industry Consumer and Producer Surplus

6. Different Cost Functions We have looked at two cases:

7. Different Cost Functions We have looked at two case: –Firms with identical cost functions –Firms with different cost functions.

8. Different Cost Functions We have looked at two cases: To most, it seems obvious that firms have different cost functions.

9. Different Cost Functions We have looked at two cases: To most, it seems obvious that firms have different cost functions. –Not to economists –How can one firm have special knowledge?

10. Sources of Differences Different Endowments

11. Sources of Differences Different Endowments –Suppose farmer Jones has rich flat bottomland, while Smith has hilly rocky land. –Then different production functions and hence different AC and MC functions.

12. Sources of Differences Different Endowments Learning Curve –Suppose Smith is just starting out, while Jones is an old hand at this business.

13. Sources of Differences Different Endowments Learning Curve Aging Plants –Smith has a new plant; Jones has a clunker.

14. Sources of Differences Different Endowments Learning Curve Aging Plants Patents and other know how.

15. Economic and Accounting Profits We are told that firms are in business to make a profit.

16. Economic and Accounting Profits We are told that firms are in business to make a profit. –When firms are identical and industry is in equilibrium P = AC, meaning zero profit.

17. Economic and Accounting Profits We are told that firms are in business to make a profit. –When firms are identical and industry is in equilibrium P = AC, meaning zero profit. –Accountants and the IRS take a different view.

18. Economic and Accounting Profits We are told that firms are in business to make a profit. The difference is Economic Profits vs. Accounting Profits.

19. Economic and Accounting Profits Joe Smith Widget Works sold $1,000,000 last year. –Paid workers $700,000 –Accountants and the IRS would record profits of $300,000

20. Economic and Accounting Profits The difference is opportunity cost

21. Economic and Accounting Profits The difference is opportunity cost –Joe could have earned $150,000 working for Baker Widgets –Joe had $1,500,000 in business, could have earned 10% elsewhere.

22. Economic and Accounting Profits The difference is opportunity cost Then economic profits are zero; the $300,000 represents opportunity cost.

23. Taxing a Competitive Industry

24. D p min Q Q* T P min + T

25. Upward Sloping Supply Curve D Q S P

26. D Q S S+T T P

27. Upward Sloping Supply Curve D Q Q* S S+T T P PCPC PSPS

28. How Much Gets Passed

30. Consumer and Producer Surplus

31. D Q* S P*

32. Consumer and Producer Surplus D Q* S P* CS

33. Consumer and Producer Surplus D Q* S P* CS PS

34. End ©2003 Charles W. Upton