Inventory is a substitute for knowledge. Since you don’t always know just how much inventory you are actually going to need and since inventory costs money, a business enterprise must try to limit how much inventory it has on hand. Those businesses, which have the greatest amount of knowledge and come closest to the optimal size of inventory, will have their profit prospects enhanced. Just as prices in general affect the allocation of resources from one place to another at a given time, so returns on investment affect the allocation of resources from one time period to another. A high rate of return provides incentives for people to save and invest more than they would at a lower rate of return. – A higher rate of return encourages people to consume less in the present so that they may consume more in the future. It allocates resources over time. The present value of an asset is in fact nothing more than its anticipated future returns, added up and discounted for the fac