In economics it means something that you invest in that pays you back. Dk dt = sf (k)−nk.Figure 2 graphs this equation. Which means we can re-state the equation for changes in the stock of capital. Wealth capital stock is the capital stock evaluated at its market value. The clear and complete guide to economic order quantity (EOQ): Learn the EOQ formula and how to use it to optimise your business. This report summarizes project efforts. Chapter I describes the basis for productive highway capital stock measures. Health is a stock variable in the sense that it's measured at one point in time but represents something that has been accumulated or depreciated over time. BEA's estimates of capital stocks valued in constant 1972 dollars for selected major aggregates. 1.1.