•If we vary a single input and keep all other inputs constant, we get different levels of output for different levels of that input.

•This relationship between the variable input and output, keeping all other inputs constant, is often referred to as Total Product (TP) of the variable input.

•The total product of labour schedule with *K*2 = 4 is shown in Table.

•This is also sometimes called total return to or total physical product of the variable input.

•Average product is defined as the output per unit of variable input.

•Average Product is calculated as *AP*_{L}=TP_{L}/L

•The last column of table gives us a numerical example of average product of labour (with capital fixed at 4) for the production function described in table.

•Values in this column are obtained by dividing TP by L

•Marginal product of an input is defined as the change in output per unit of change in the input when all other inputs are held constant.

•When capital is held constant, the marginal product of labour is

•MP_{L} =Change in Output/Change in Input *=âˆ†TP*_{L}/ âˆ† L

•where *âˆ†* represents the change of the variable.

•The third column of table 3.2 gives us a numerical example of Marginal Product of labour (with capital fixed at 4) for the production function described

•Values in this column are obtained by dividing change in TP by change in L.

•MP_{L} *=âˆ†TP*_{L}/ âˆ† L

•Since inputs cannot take negative values, marginal product is undefined at zero level of input employment.

•For any level of an input, the sum of marginal products of every preceding unit of that input gives the total product.

•Hence, the total product is the sum of marginal products.

•Average product of an input at any level of employment is the average of all marginal products up to that level.

•Average and marginal products are often referred to as average and marginal returns, respectively, to the variable input.

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