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 TodayOXYOccidental Petroleum$61.17 +0.97 (+1.61%) 52-Week Range$55.12▼$71.18Dividend Yield1.44%P/E Ra ...