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.
Quick Answer. Most sharks are not physiologically capable of living in freshwater, although the bull shark is an exception. In order to live in freshwater, the body of water would need to be wide and deep enough to accommodate the shark, and it would have to be connected to the ocean for the shark to get there in the first place. Keep Learning.