Suppose an industry is made up of 25 firms, all with equal market share. The four-firm concentration ratio of this industry is

The new growth theory asserts that

A) eventually people earn only a subsistence living. B) a discovery can be used by only one person, the discoverer. C) technology improves slowly while population grows rapidly. D) production processes can be replicated at many different firms in the economy. E) the population growth rate will increase when real GDP per person increases.

In the above figure, using the slope across an arc, the slope of the curve between points a and b is

A) 1/2. B) -1/2. C) 2. D) -2.