Definition of Riskless arbitrage

Riskless arbitrage

The simultaneous purchase and sale of the same asset to yield a profit.

Arbitrage

The simultaneous buying and selling of a security at two different prices in two different markets,
resulting in profits without risk. Perfectly efficient markets present no arbitrage opportunities. Perfectly
efficient markets seldom exist.

Arbitrage Pricing Theory (APT)

An alternative model to the capital asset pricing model developed by
Stephen Ross and based purely on arbitrage arguments.

Arbitrage-free option-pricing models

Yield curve option-pricing models.

Arbitrageurs

People who search for and exploit arbitrage opportunities.

Covered interest arbitrage

A portfolio manager invests dollars in an instrument denominated in a foreign
currency and hedges his resulting foreign exchange risk by selling the proceeds of the investment forward for
dollars.

Currency arbitrage

Taking advantage of divergences in exchange rates in different money markets by
buying a currency in one market and selling it in another market.

Index arbitrage

An investment/trading strategy that exploits divergences between actual and theoretical
futures prices.

Risk arbitrage

Speculation on perceived mispriced securities, usually in connection with merger and
acquisition deals. Mike Donatelli, John Demasi, Frank Cohane, and Scott Lewis are all hardcore arbs. They
had a huge BT/MCI position in the summer of 1997, and came out smelling like roses.

Risk controlled arbitrage

A self-funding, self-hedged series of transactions that generally utilize mortgage
securities as the primary assets.

Riskless rate

The rate earned on a riskless investment, typically the rate earned on the 90-day U.S. Treasury Bill.

Riskless rate of return

The rate earned on a riskless asset.

Riskless or risk-free asset

An asset whose future return is known today with certainty. The risk free asset is
commonly defined as short-term obligations of the U.S. government.

Structured arbitrage transaction

A self-funding, self-hedged series of transactions that usually utilize
mortgage securities as the primary assets.

Triangular arbitrage

Striking offsetting deals among three markets simultaneously to obtain an arbitrage profit.

Arbitrage

The purchase of securities on one market for immediate resale on
another market in order to profit from a price or currency discrepancy.

Arbitrage

Transactions designed to make a sure profit from inconsistent prices.

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