A firm uses 80 hours of labor and 6 units of capital to produce 10,000 gadgets per day. Labor's marginal product is 4 gadgets per hour and the marginal product of capital is 20 gadgets per hour. Each unit of labor costs $8 per hour and each unit of capital costs $50 per hour. If the firm wants to continue producing 10,000 gadgets per day at the lowest possible cost, it should
A. continue using 80 hours of labor and 6 units of capital.
B. use less of both inputs.
C. use more labor and less capital.
D. use more capital and less labor.

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.