Monetary authority is a generic term in finance and economics for the entity which controls the money supply of a given currency, and has the right to set interest rates, and other parameters which control the cost and availability of money. The field of finance refers to the concepts of Time, Money and Risk and how they are interrelated Economics is the social science that studies the production distribution, and consumption of goods and services. In Economics, money supply, or money stock, is the total amount of money available in an Economy at a particular point in time A currency is a unit of exchange, facilitating the transfer of Goods and/or services It is one form of Money, where money is Interest is a fee paid on borrowed capital Assets lent include Money, Shares, Consumer goods through Hire purchase, major assets Generally a monetary authority is a central bank, though often the executive branch of a government has de facto control over monetary policy by controlling the central bank. A central bank, reserve bank, or monetary authority is the entity responsible for the Monetary policy of a country or of a group of member states In Political science and Constitutional law, the executive is the branch of government responsible for the day-to-day management of the State. There are other arrangements, for example a central bank for several nations, a currency board which restricts currency issuance to the amount of another currency or free banking where a broad range of entities can issue notes or coin. A currency board is a Monetary authority which is required to maintain a Fixed exchange rate with a foreign currency Free banking is a theory of Banking in which commercial banks and market forces control the provision of banking services