K 31 4 Suppose that a production function is given by F(L, K) =1 4 K " in which case the marginal products will be given by MPL= and MPK = respectively. What is the marginal rate of technical substitution at (/., A) = (3, 18) , and what is the interpretation? AL 4K 1 . which means that in order to maintain the same level of output, then if you increase A" by one unit, you must decrease /. by two units. O -2, which means that in order to maintain the same level of output, then if you decrease /. by one unit, you must increase A" by two units. O which means that in order to maintain the same level of output, then if you increase K" by one unit, you must decrease /. by two units. 2, which means that in order to maintain the same level of output, then if you decrease /. by one unit, you must increase A by two units