Mutual interdependence means that each oligopolistic firm: a. faces a perfectly elastic demand for its product. b. must consider the reactions of its rivals when it determines its price policy. c. produces a product identical to those of its rivals. d. produces a product similar but not identical to the products of its rivals.

Mutual interdependence means that each oligopolistic firm must consider the reactions of its rivals when it determines its price policy.

An oligopoly has a limited amount of competition because there is a small amount of producers or sellers in the market. Because there is a small amount, they consider the reactions someone else may have if they change the the price policy. These firms can not keep each other from having a large influence over the market. 

The business cycle is the periodic but irregular up-and-down movement in economic activity, measured by fluctuations in real gross domestic product (gdp) and other macroeconomic variables. a business cycle is typically characterized by four phases—recession, recovery, growth, and decline—that repeat themselves over time. economists note, however, that complete business cycles vary in length. the duration of business cycles can be anywhere from about two to twelve years, with most cycles averaging six years in length. some business analysts use the business cycle model and terminology to study and explain fluctuations in business inventory and other individual elements of corporate operations. but the term "business cycle" is still primarily associated with larger (industry-wide, regional, national, or even international) business trends.