Final answer:
Producers have a comparative advantage when their opportunity cost is lower. K C has a comparative advantage in processing tax returns, and Sam has a comparative advantage in making sales calls.
Step-by-step explanation:
Producers have a comparative advantage when their opportunity cost of producing a good or service is lower than that of other producers. In this case, the opportunity cost is measured in terms of what is given up to produce a certain quantity of another good or service.
To determine which producer has a comparative advantage in processing tax returns, we need to compare the opportunity cost per tax return. From the table, we can see that Sam has an opportunity cost of 10 sales calls per tax return, while K C has an opportunity cost of 4 sales calls per tax return. Therefore, K C has a comparative advantage in processing tax returns because their opportunity cost is lower.
Similarly, to determine which producer has a comparative advantage in making sales calls, we compare the opportunity cost per sales call. Sam's opportunity cost is 0.1 tax returns per sales call, while K C's opportunity cost is 0.25 tax returns per sales call. Therefore, Sam has a comparative advantage in making sales calls because his opportunity cost is lower.