If I told you the production function that generated the isoquants is Q = 21.5L0.35 K0.5, is your answer to question 18 dependent on whether Q is a small number or a large number?
This sort of a production is going to exhibit decreasing returns to scale and is not dependent on whether Q is a small number or a large number. Thus in short Q doesn't matter.
Explanation : Production function : Q = 21.5*(L^0.35)*(K^0.5)
Now if both L and K are multiplied by the same factor t, then new Q will be : Q(new) = 21.5*((tL)^0.35)*((tK)^0.5)
= t^(0.35+0.5)*21.5*(L^0.35)*(K^0.5)
= (t^0.85)*Q
Thus here we see that when L and K are increased by t factor, Q changes by t^0.85 (which is less than 1), thus showing decreasing returns to scale. No matter what value Q takes the answer will remain the same.
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