LONG PERIOD ANALYSIS:

Long period refers to a time when all the factors are variable. Earlier in the short period analysis, we had considered capital (K) to be fixed factor. Here in this part, we assume both L and K to be variable factors. Therefore, the production function would be: 

           q = F(L, K) 

The producer can now employ L and K units at her will to produce output q as per the production technology. Therefore, in the K - L input space the producer can choose any combination of K and L to produce output.