The reasons to carry inventory in warehouse 

 take calendar period of time (quarter, half year or a year ) and calculate with amount of volume ( have to be presented in report) what is the ideal amount of of inventory, including explanation of the decision based on price, size of the facility, volume of movements and a budget of operation. Including the explicit calculation with conclusions on every point of calculation 

Include:

-Budget of the facility

-Volume possibility

-Calculations that bring you to the conclusion

- The number of product(s) that your warehouse can bare 

-Explanation of the calculation for the finance dep with pros for the improving profit 

- Have to be market value realistic