The Production Function $f ( k , \ell ) = A \left( \alpha \ell ^ { - \rho } + ( 1 - \alpha ) k ^ { - \rho } \right) ^ { - \beta / \rho }$

True/False

The production function $f ( k , \ell ) = A \left( \alpha \ell ^ { - \rho } + ( 1 - \alpha ) k ^ { - \rho } \right) ^ { - \beta / \rho }$ can have increasing returns to scale or decreasing returns to scale -- but it cannot have initially increasing and eventually decreasing returns to scale.