Answer:
a. More labor and less capital should be used to reduce cost.
Step-by-step explanation:
Condition for profit maximization is where the Marginal rate of technical substitution = Ratio of factor-input prices. This condition is known as a Producer Optimum in Long Run. MRTS itself is the ratio of Marginal Productivity of Labor to Capital. Thus, MRTS > w/r implies that Relative marginal productivity of labor is greater than relative cost of labor. This means that labor comes cheaper than capital when both their productivities are compared. So it is profitable to employ more labor than capital. This will continue till wages increase up to the point where MRTS = w/r.