Real Capital Real capital refers to the physical stock of goods which are used as inputs in the production process. Thus, the machines, raw materials etc. are the examples of real capital. This is also called concrete capital. The contribution of real capital towards the increase in national output of any country is certainly more important than the money capital because money capital does not necessarily contribute towards the increase in national output.
Money Capital: We may use the term 'Money Capital' or 'Finance Capital' to describe capital in terms of money. Money itself is not the means of production. However, money can be used for buying capital goods (like machines, and raw materials). It would not be wrong to treat the money used for this purpose as capital.
Debt Capital: Debt capital consists of titles to wealth, like share, debentures, government promissory notes, etc. They represent invested funds and yield income. For example, if any individual invests his fund in purchasing govt. bonds, IDBI flexibonds, ICICI bonds, etc., in our country, then he will earn fixed interest income on the value of these bonds. Hence, these bonds are considered as debt capital.