The intertemporal CAPM expands investor behavior to include values of future state variables, such as labor income, consumer goods prices, and investment alternatives, after the initial period. Additional betas capture the effects of these variables in multifactor models. The most common is the three-factor model that relates expected excess return to excess market return, measures the difference in returns between small- and big-company portfolios, and measures the difference between returns on portfolios with high and low B/Ms.