When "rent controls" result in a shortage of housing, landlords

A manager of a small company makes the following statement – "We need to keep hiring additional workers up to the point where the marginal productivity of the last worker we hire is at its maximum

This way we can maximize the total productivity of the firm." Critically evaluate this statement.

Which of the following best describes a situation where research is considered relatively fertile?

A) research that translates into many new products B) research that costs the firms relatively little money C) research that cannot be easily copied by other firms D) all of the above E) none of the above