Our analysis of production and cost begins with a period economists call the short. run. Theshort run in this microeconomic context is a planning period over which the. managers of a firm must consider one or more of their factors of production as fixed.
Sharks have two sets of paired fins on the sides of their body, in the same general position as the main wings and horizontal tail wings of a plane. The shark can position these fins at different angles, changing the path of the water moving around them.
Most species of sharks have at least two sets of median fins situated along the central line of the body. There are one or two dorsal fins on the top, a caudal fin, which is the tail, and an anal fin located at the underside behind the anus.