" Along with his Company A and Company B teaching method, Graham used to talk about Class 1 and Class 2 truths. Class 1 truths were absolutes. Class 2 truths became truths by conviction. If enough people thought a company’s stock was worth X, it became worth X until enough people thought otherwise. Yet that did not affect the stock’s intrinsic value—which was a Class 1 truth. "

― Alice Schroeder , The Snowball: Warren Buffett and the Business of Life