The market structure-conduct-performance schema highlights the interdependence of structure, conduct and performance and the extent to which each element can affect the others. Structure can influence conduct and performance; for example, a monopolistic market structure (see MONOPOLY) often leads to exploitative market conduct and poor market performance in the form of excessive prices and output restriction. Alternatively conduct can influence structure and performance; for example, firms seeking to increase their market shares by mergers and takeovers can raise the level of SELLER CONCENTRATION, which in turn will affect market performance. Again, performance can influence structure and conduct; for example, where established firms earn ABOVE-NORMAL PROFITS, this may induce other firms to enter the market, thereby decreasing market concentration and removing excess profits. Thus, rather than these relationships being sequential and deterministic, it is more accurate to view them as being circular.
The schema is useful to public-policy makers (see COMPETITION POLICY, INDUSTRIAL POLICY) in framing measures designed to improve market performance.
Such measures can operate on market structure, for example, by prohibiting mergers that increase market concentration or by encouraging mergers in industries suffering excess capacity. Alternatively, such measures may operate on market conduct, for example, by seeking to eliminate excess profits by prohibiting price-fixing agreements between firms. Additionally, the authorities may operate directly on market performance by regulating the prices charged by monopolistic suppliers.