Ed Yardeni sees S&P 500 rising to more than 8,000. Here’s why

Stocks are at record highs, and Ed Yardeni thinks there's much more upside to be had. The president of Yardeni Research and longtime market strategist hiked his year-end S & P 500 target to 8,250 from 7,700. That's 11.5% above Friday's close of 7,398.93. The driver for this sharp outlook boils down to one word: earnings. "I've been bullish, but not bullish enough," Yardeni told CNBC's " Squawk Box " in an interview Monday. "The earnings estimates of analysts have been phenomenal. …