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Solution
Moving from point E to point H increases the marginal product of of labour (MP of L) and decreases the marginal product of capital (MP of K) . This means that as a firm moves along an iso-quant in this way, it will become necessary to replace workers with machines and keep output at the same level. This tradeoff between labour and capital is called Marginal Rate of Technical Substitution. It is represented by slope of an iso-quant.
Explanation: Here MP of labour increases because as we move from E to H we are sacrificing less amount of labour when we are moving from left to right. It means sacrificing of labour is deccreasing to use extra machine. So therefore marginal product of capital decreasing.
Note that you have found ...... labour decreases. In general an increase in capiatal should increase output , while a decrease in labour should decrease output. Since output remains constant along all pints of iso-quant.
Change in output from changing the amount of capital is MP of capital = +10 (from point E to F)
Change in output from changing the amount of labour is MP of labour = - 3 (from point E to F)
So , del L/del K = 20/6 It means del L * MP of L = del K * MP of K = del Q = 0 , 20*-3 + 6*+10 = -60 +60 = 0
