Watches (Millions)Shoes (Thousands)Marginal Opportunity Cost $$0$$$$90,000$$- $$1$$$$80,000$$$$dfrac {10,000}{1} = 10,000$$ $$2$$$$68,000$$$$dfrac {12,000}{1} = 12,000$$ $$3$$$$52,000$$$$dfrac {16,000}{1} = 16,000$$ $$4$$$$34,000$$$$dfrac {18,000}{1} = 18,000$$ $$5$$$$10,000$$$$dfrac {24,000}{1} = 24,000$$