In economics, capital or capital goods or real capital refers to factors of production used to create goods or services that are not themselves significantly consumed (though they may depreciate) in the production process. Capital goods may be acquired with money or financial capital. In finance and accounting, capital generally refers to financial wealth, especially that used to start or maintain a business. In classical economics, capital is one of three (or four, in some formulations) factors of production. The others are land, labor and (in some versions) organization, entrepreneurship, or management. Goods with the following features are capital: It can be used in the production of other goods (this is what makes it a factor of production). It was produced, in contrast to "land," which refers to naturally occurring resources such as geographical locations and minerals. It is not used up immediately in the process of production unlike raw materials or intermediate goods. (The significant exception to this is depreciation allowance, which like intermediate goods, is treated as a business expense.) These distinctions of convenience carried over to neoclassical economics with little change in formal analysis for an extended period. There was the further clarification that capital is a stock. As such, its value can be estimated at a point in time, say December 31. By contrast, investment, as production to be added to the capital stock, is described as taking place over time