<P> Adam Smith defines capital as "That part of a man's stock which he expects to afford him revenue". The term "stock" is derived from the Old English word for stump or tree trunk . It has been used to refer to all the moveable property of a farm since at least 1510 . </P> <P> How a capital good is maintained or returned to its pre-production state varies with the type of capital involved . In most cases capital is replaced after a depreciation period as newer forms of capital make continued use of current capital non profitable . It is also possible that advances make an obsolete form of capital practical again . </P> <P> Capital is distinct from land (or non-renewable resources) in that capital can be increased by human labor . At any given moment in time, total physical capital may be referred to as the capital stock (which is not to be confused with the capital stock of a business entity). </P> <P> In a fundamental sense, capital consists of anything that can enhance a person's power to perform economically useful work--a stone or an arrow is capital for a caveman who can use it as a hunting instrument, and roads are capital for inhabitants of a city . Capital is an input in the production function . Homes and personal autos are not usually defined as capital but as durable goods because they are not used in a production of saleable goods and services . </P>

Do you consider money as capital in economics