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.
What Kind Of Shark Can Live In Fresh Water? Although some sharks can swim into river estuaries with mixed fresh and salt water and some even use this areas as nursery for young sharks, most of the time they live in ocean water. However there are two species that are capable of surviving long time in fresh water with physiological adaptations that allow this.