Sharpe-Linter CAPM theory converts the mean-variance model into a market-clearing asset-pricing model. All investors agree on the distributions and may borrow or lend without limit at a risk-free rate. The risk-free rate clears the market for borrowing and lending. Combining the risk-free asset and risky assets results in a linear mean-variance-efficient frontier that is tangent to the efficient frontier/risky asset frontier. All who hold risky assets hold this tangent portfolio, the value-weighted portfolio of all risky assets. The CAPM implies that the market portfolio is efficient.