There are four firms supplying the market. Market supply is 50 units at $20 and 100 units at $40. The table lists the market share of each firm at the two prices. Which firm does not show a normal upward-sloping supply curve?
- A% market share at $20: 10; at $40: 10
- B% market share at $20: 20; at $40: 50
- C% market share at $20: 30; at $40: 20
- D% market share at $20: 40; at $40: 20