The typical advice in the financial market is to never blindly follow a whale investor like Warren Buffett. However, these investors' reverse-engineering investment decisions can often prove helpful. Today, Warren Buffett didn't buy more shares of Occidental Petroleum Co. NYSE: OXY because the economy is slowing but because a commodity supercycle could be about to push oil prices higher. Occidental Petroleum ▼ OXY +0.97 (+1.61%) $71.18 P/E Ratio 16.71 Add to Watchlist Get Berkshire Hathaway alerts: Buffett' ...