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Account
A record of all transactions.

Account Balance
See Balance.

Agent
An individual employed to act on behalf of another (the principal).

Aggregate Demand
The sum of government spending, personal consumption expenditures and business expenditures.

All or None
A limit price order that instructs the FCM to fill the whole order at the stated price or not at all.

Appreciation
An increase in the value of an asset; the rising of a price in response to market demand.

Arbitrage
The use of countervailing prices in different markets to profit from small price differentials via the purchase or sale of an instrument and simultaneous taking of an equal and oppostie position in a related market.

Ask Size
The amount of shares being offered for sale at the ask rate.

Ask Rate
The lowest price at which a financial instrument is offered for sale.

Attorney in Fact
A person who, by virtue of having power of attorney, is allowed to transact business and execute documents on behalf of another person.

Asset Allocation
The distribution of funds among different markets (such as Forex, stocks, bonds, commodities and real estate) to achieve diversification for risk management purposes and/or expected returns.