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Contracts for Difference (in short CFDs) are trading instruments that allow to enter into an agreement to exchange the difference in value of a particular product between the time at which a contract is opened and the time at which it is closed.
CDFs are entered into by the buyer and the seller (or a CDF provider). At the close of the contract both parties exchange the difference between the opening price and the closing price of the underlying financial instrument (share, commodity, etc).
CDFs differ from the traditional trading techniques. They are not a purchase of a nominated investment whether it’s a share, commodity or index, but trading on the movement of the price.
CDFs have considerably lower capital requirements, allowing the investors to trade on the price of a product without actually purchasing it or on the price of a stock without buying or selling it.
CFD speculation is the world’s fastest growing instrument. Learn more about share trading with CFDs and get into action.

We have shown how to estimate VAR for an individual security holding but most investors hold a number of different securities or positions. They are less concerned about the changes in the value of individual holdings and more concerned about changes in the total value of all their holdings. In general, VAR for a portfolio of financial assets cannot be calculated from the simple sum of the VARs for the individual holdings.
We need to take another statistical diversion and introduce another concept, that of the correlation (or the relationship) between changes in a number of different variables.

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