in which phase a rational producer will operate in short run - Economics - Production and Costs

Question

in which phase a rational producer will operate in short run?

Gurdeep Singh Bhatia · Accepted Answer

A rational consumer aims to operate in the phase of diminishing
returns to a factor when TP is maximum (and MP=0) because after
that stage, there are no incentives to produce any further unit of
output as TP starts declining (and MP becomes negative)