Assume the rock lobster is sold for $5 on the market.

As a consequence, the rock lobster may be sold for a higher price at $6.

But the costs of the fisher to catch one rock lobster remain the same at $3.

The area also produces rock lobsters just a few meters off shore.

Well, rock lobsters are back in the news, and in a musical sort of way, too.

After cooking her rock lobsters, "we stayed up and talked for a while.

The dinner of rock lobster and red snapper proved to be delicious.

In the figure at right, rock lobsters are studied off the coast of Tasmania.

In the Australian fishery market the rock lobster brought the largest revenue; exchanged for a value of $407 million.

However, assume the fisher has managed to decrease the costs for catching rock lobster from $3 to $2.