Capital stock is the number of common and preferred shares that a company is authorized to issue, and is recorded in shareholders' equity. The capital stock is an important source of propagation in slumps, a point that has escaped analysis in the cycle-around-trend view of fluctuations.It is the total amount of physical capital at any particular moment in time. Capital is one of the factors of production. An increase in saving and investment raises the capital stock and thus raises the full-employment national income and product. This chapter deals with the most simple kind of macroeconomic model, which abstracts from all issues of heterogeneity and distribution among. Capital accumulation refers to an increase in assets from investments or profits and is one of the building blocks of a capitalist economy. Capital stock is the total quantity of capital used in the production of goods and services, including factories, buildings, equipment, tools, and machinery. Remember that k is a stock variable, while i is a flow variable. The capital stock cannot grow faster than effective labor for a long time because of decreasing returns to capital.