The four-firm concentration ratio for the national industry does not capture the effects of all of the following, except

A) localized markets when transportation costs are high.
B) interindustry competition.
C) import competition when there is world trade.
D) market coverage of the four largest firms.

Four-firm Concentration Ratio

A measure indicating the total market share controlled by the four largest firms in an industry, used to determine the competitiveness of the market.

Localized Markets

Markets that are confined to a specific geographical area, where the products or services cater primarily to the local population.

Import Competition

Import competition involves domestic companies facing competition from foreign-produced goods and services in the domestic market.