Suppose each of the 50 states had only one gasoline station, and all stations were the same size. The four-firm concentration ratio for the state of New York, based on the state data, is:

One of the least squares assumptions in the multiple regression model is that you have random variables which are "i.i.d." This stands for

A) initially indeterminate differences. B) irregularly integrated dichotomies. C) identically initiated deltas (as in changes). D) independently and identically distributed.

The two labor markets in the "dual labor market" are

A) southern versus northern. B) western versus eastern. C) English speaking versus non-English speaking. D) domestic versus foreign. E) none of the above