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.
They have a white strip or white patch on the back bottom of the dorsal fin and a secondary keel on the tail. Only two shark species have a secondary keel on their tail; the other species is the salmon shark, which is also in this Lamnidae family.Porbeagle teeth have protrusions at the base and the teeth are smooth edged.nly two shark species have a secondary keel on their tail; the other species is the salmon shark, which is also in this Lamnidae family. Porbeagle teeth have protrusions at the base and the teeth are smooth edged.