Which of the following statement is NOT correct?

		If CAMP is true, the market portfolio is on the mean-variance efficiency frontier
		In an economy that has four risky assets and NO risk-free asset, any portfolio under the mean-variance efficiency frontier is the sub-optimal
		In an economy that has four risky assets and a risk-free asset, the tangency portfolio is the best plausible risky portfolio
		APT assumes the market clears