Suppose the domestic U.S. beta of IBM is 1.0, the expected return on the U.S. market portfolio is 13.5 percent, and the U.S. T-bill rate is 6 percent. If the world beta measure of IBM is 0.90, then how much (in percentage) would IBM's equity capital cost be lower if the U.S. markets were fully integrated with the rest of the world compared to if U.S. markets were segmented?