The ________ is the share of industry output in sales or employment accounted for by the top firms in an industry.

A) concentration ratio
B) contestability ratio
C) competitive index
D) collusive level

Concentration Ratio

The share of industry output in sales or employment accounted for by the top firms.

Industry Output

The total production or quantity of goods and services produced within a specific industry over a given period.

Top Firms

The leading or most successful companies in a particular industry or sector based on criteria like revenue, innovation, market share, or profitability.