The table above shows the revenue figures for the top four firms along with a total for the remaining firms in the fast-food industry. What is the four-firm concentration ratio for the industry?

When Xt is strictly exogenous, the following estimator(s) of dynamic causal effects are available:

A) estimating an ADL model and calculating the dynamic multipliers from the estimated ADL coefficients B) using GLS to estimate the coefficients of the distributed lag model C) neither (a) or (b) D) (a) and (b)

Relative to private firms, we should expect public bureaus to be

a. smaller b. more cost-efficient c. less responsive to consumer demand d. more concerned with adopting new technologies e. more in tune with consumer desires