A subsistence economy is an economy which refers simply to the gathering or amassment of objects of value; the increase in wealth; or the creation of wealth. Capital can be generally defined as assets invested with the expectation that their value will increase, usually because there is the expectation of profit, rent, interest, royalties, capital gain or some other kind of return. However, this type of economy cannot usually become wealthy by virtue of the system, and instead requires further investments to stimulate economic growth. In other words, a subsistence economy only possesses enough goods to be used by a particular nation to maintain its existence and provides little to no surplus for other investments. Therefore, this type of economy aims to create economic stability so that capital can be accumulated and the inevitable economic surplus can be invested in other potentially lucrative business ventures.