Susan switches from going to speedy lube for an oil change to changing oil in her own car herself. which of the following is correct? the value of changing the oil a) included in the gdp whether susan changes the oil or pays speedy lube to do it b) included in the gdp whether susan pays speedy lube to change it but not to change it herselfc) included in the gdp if susan changes it herself, but not if she pays speedy lube to change itd) not included in the gdp if neither susan or speedy lube changes the oil

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.