From about 1890 till 1970 year, the “structure-conduct-performance paradigm” dominated theories regarding how firms behave in various types of markets. The term here “performance” in this context refers to those things as: (i) decisions by firms regarding pricing, production, profitability, investments within research and development, marketing strategies and so on. (ii) how the distribution of income is affected by the activities of unregulated firms. (iii) the numbers of firms, the markets from that these firms hire resources, and the types of goods produced and sold. (iv) the relative profitability of firms in the industry, the relative efficiencies of different market structures, and their effects upon the distribution of income and social welfare. (v) All of the above.
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