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.
Sharks belong to the class of boneless fish known as Chondrichthyes. The Chondrichthyes class is divided in two sub-classes Holocephali {Chimeras) and Elasmobranchii {Sharks and Rays}. Similar species of sharks are put into Families, and families with similar characteristics are placed in larger groups called Orders.