Question $29$

Suppose the production function for a country is Y$=$F$($K$,$L$)$Y $=$ F$($K$,$ L$)$Y$=$F$($K$,$L$).$ In this equation, constant returns to scale means that if we multiply the function by a factor zzz$,$ the new equation is:

zF$($K$,$L$)$zF$($K$,$ L$)$zF$($K$,$L$)$

F$($K$,$L$)+$zF$($K$,$ L$)+$ zF$($K$,$L$)+$z

zF$($zK$,$zL$)$zF$($zK$,$ zL$)$zF$($zK$,$zL$)$