In our widget example, we will assume that the fixed cost for the stapler, pen, and âfactoryâ is $10 and the cost of each worker hired is $5 per worker. Since fixed costs are constant, the firm incurs $10 regardless of the level of output. Labor is the only variable cost computed by $5 times the number of workers.
How Bull Sharks Can Live in Both Ocean and Fresh Water. Although there are a handful of species that live in freshwater, we tend to think of sharks as being ocean dwellers. But there is also a very unique shark that can live in both ocean and fresh water estuaries and lakes: the Bull Shark.
Sharks are carnivorous and may be found in all seas. They associate humans with food. Sharks do not usually live in fresh waters, but there are exceptions: the river shark and the bull shark. Most sharks are found in 2,000 meters (7,000 ft) level, in warm environments, but they can also be seen in shallow waters.