You might think that when a production function has a diminishing marginal rate of technical substitution of

Question:

You might think that when a production function has a diminishing marginal rate of technical substitution of labor for capital, it cannot have increasing marginal products of capital and labor. Show that this is not true, using the production function Q = K2L2, with the corresponding marginal products MPK = 2KL2 and MPL = 2K2L.