Suppose that average income in the world and the cost of catching fish are both equal to their initial values, US$5,000 per year for income and US$2,500 per ton for cost.
Drag the vertical green line back and forth to determine the equilibrium quantity of fish caught under these conditions:
A. 30 million tons of fish
B. 50 million tons of fish
C. 40 million tons of fish
D. 25 million tons of fish