The paper examines the classical problem of optimization of the size of a delivery to a warehouse. Using
a model developed by the author, simulations were conducted using data obtained from companies in Poland.
The results revealed that the impact of this optimization on the economic efficiency of an enterprise can be
considerable in some cases. It is difficult, however, to develop an appropriate mathematical formula for solving
such a problem. The use of a simulation seems to be more appropriate for solving this problem than optimization
models.