Question

In: Economics

1a. Define and discuss homogenous functions. 1b. Homogenous functions have interesting mathematical properties. Name and discuss...

1a. Define and discuss homogenous functions. 1b. Homogenous functions have interesting mathematical properties. Name and discuss two.

Solutions

Expert Solution

1a. If ƒ : VW is a function between two vector spaces over a field F, and n is an integer, then ƒ is said to be homogeneous of degree n if

f(αv) = αnf(v)

M(x, y) = 3x 2 + xy is a homogeneous function when we add the powers of x and y in both the term it is the same (i.e. x2 is x to power 2 and xy = x1y1 giving total power of 1 + 1 = 2). The degree of this homogeneous function is 2.

1b.Examples

(i) The average physical product of capital(K) and labour(L) can be expressed as a function of capital labour ratio.

Q = f(L,K)...(1)

Let us multuply equation 1 with a factor(p) = 1/L

f(L/L, K/L) = Q/L

⇒ f [(1,K/L)] = Q/L

⇒ g (K/L) = APL (Q/L = Average product of labor).....(2)

Similarly, we would have

Q/K = h(L/K)

⇒ APK = h (L/K) .......(3)

Eqns. (2) and (3) give us that if L and K are increased by the firm in the same proportion, keeping the K/L ratio constant, then there would be absolutely no change in APL and APK, i.e., the APL and APK functions are homogeneous of degree zero in L and K.

(ii) Euler's theorem

If u = f(x,y) then we can say that,

In a function of two independent variable x and y if we multiply x with the partial differentiation of that function with respect to x and add it to the multiplication of y with the partial diffrentiation of that function with respect to y it will be equal to dgree times( or, order) the function itself.

x *​ du/dx + y* du/dy = n* u [ n is the order of the function, u is the function itself)

I think this will be the answer. Thank you.


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