Investment great Warren Buffett once said, ‘Be fearful when others are greedy,’ but according to a team of equity strategists at Citi, investors are pushing back against the idea that the S&P 500 (INDEXSP:.INX) may be growing faster than earnings warrant. Tobias Levkovich, Lorraine Schmitt, and Christina Wood released a strategy document after being told by numerous clients in the same week that the S&P 500 would grow by 30 or 40 percent this year, and that there are not viable investment alternatives. See: S&P 500 Valuation Spread at 25 Year Low S&P 500: Analysts say to use common sense regarding…