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.
Based on the video, the great white shark that struck the cage didnât appear to be fully grown, as Boston.com points out. Nevertheless, white sharks can swim as fast as 35 mph underwater and have been known to attack with such momentum that they are often carried fully out of the waves. These breach attacks, which are common off the coast of South Africa, routinely yield stunning footage, as the Huffington Post points out.