This work takes the theory behind the VaR (Value at Risk) indicator, as it is used at financial sector, and applies it to economic valuation of projects in the real sector, particularly in manufacturing, and specifically in the valuation of economics effects of holding some inventory policy. The idea is to study the VaR over the Present Value of a Company, and the variations induced on this indicator for the changes made to the account “working capital”, related to inventory policies. The VaR will be calculated using Monte Carlo Simulation, and a case study will be presented and analyzed.