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Maintenance margin - The minimum margin which an investor must keep on deposit in a margin account at all times in respect of each open contract.

Make a market - A dealer is said to make a market when he or she quotes bid and offer prices at which he or she stands ready to buy and sell.

Managed float - When the monetary authorities intervene regularly in the market to stabilize the rates or to aim the exchange rate in a required direction.

Margin call - A demand for additional funds to be deposited in a margin account to meet margin requirements because of adverse future price movements.

Margin - For currencies a deposit made to the forex firm on establishing a futures position account.

Mark to market - The daily adjustment of an account to reflect accrued profits and losses often required to calculate variations of margins.

Market maker - A market maker is a person or firm authorized to create and maintain a market in an instrument.

Market order - An order to buy or sell a financial instrument immediately at the best possible price.

Micro economics - The study of economic activity as it applies to individual firms or well defined small groups of individuals or economic sectors.

Mid-price or middle rate - The price half-way between the two prices, or the average of both buying and selling prices offered by the market makers.

Minimum price fluctuation - The smallest increment of market price movement possible in a given futures contract.

Monetary Base - Currency in circulation plus banks' required and excess deposits at the central bank.

Moving Average - A way of smoothing a set of data, widely used in price time series.