Antitrust laws attempt to promote competition by controlling

Assume that when price is $20, quantity demanded is 9 units, and when price is $19, quantity demanded is 10 units. Based on this information, what is the marginal revenue resulting from an increase in output from 9 units to 10 units?

A) $20 B) $19 C) $10 D) $1

Given that all countries have the same Cobb-Douglas production function, i.e. Y/N = (K/N)b, where b = 0.5, then a ten-fold difference in per capita income requires a difference in capital per capita by a factor of

A) 10. B) 100. C) 1000. D) 10,000.