In finance, arbitrage pricing theory (APT) is a general theory of asset pricing that holds that the expected return of a financial asset can be modeled as a linear function of various macro-economic factors or theoretical market indices, where sensitivity to changes in each factor is represented by a factor-specific beta coefficient. The model-derived rate of return will then be used to price the asset correctly - the asset price should equal the expected end of period price discounted at the rate implied by the model. If the price diverges, arbitrage should bring it back into line.
The theory was proposed by the economist Stephen Ross in 1976.
Read more about Arbitrage Pricing Theory: The APT Model, Arbitrage and The APT, Relationship With The Capital Asset Pricing Model (CAPM)
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