Energy is the least expensive sector in the S&P 500 but gene...

Energy is the least expensive sector in the S&P 500 but generates the most cash. Perhaps this explains why Warren Buffett continues to increase his position in Occidental Petroleum $Occidental Petroleum (OXY.US)$ $S&P 500 Index (.SPX.US)$ $SPDR S&P 500 ETF (SPY.US)$