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The Capital Asset Pricing Model (CAPM) is designed to measure the expected return of an asset based on its systematic risk in relation to the overall market. It emphasizes how individual securities contribute to the risk and return of an investment portfolio, instead of examining their risk in isolation or tracking historical performance.

The core principle behind CAPM is that the risk of an individual security cannot be understood without considering its relationship to the broader market. Hence, it calculates the expected return of a security by factoring in its beta, which quantifies its volatility in comparison to the market. This allows investors to assess how adding a particular security to a portfolio would influence the total risk and potential return.

Other options focus on aspects not central to what CAPM specifically addresses; the risk of securities in isolation does not account for the benefits of diversification, while the value of a company's assets over time relates to asset valuation rather than risk and return dynamics. Similarly, tracking historical performance pertains more to empirical market studies than to the predictive nature of CAPM.