The Thneedville Thneed Group (TTG) produces high-quality thneeds for those that need thneeds. The TTG output function is T=20K(0.4)L(0.5), where K and L are their annual capital and labor inputs, r.
b) A) Represents the interest rate
B) Represents the labor productivity
C) Represents the depreciation rate
D) Represents the technological progress rate