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5. While both CAPM and APT models arrive at the same conclusion that market risk exposure should be the only in explaining return, the main difference is that CAPM describes a specific risk-return relationship of while APT describes the relationship for 6. Yield to Maturity (YTM) is deemed to be unrealistic number as it assumes perfect at the same rate. However, YTM is still useful as it depicts the of return on the bond. rare