WisdomTree Continuous Commodity Index Fund ( GCC ): Based on the Thomson Reuters Equal Weight Continuous Commodity Total Return Index, this 17-commodity tracker underweights oil, at least compared to the production-weighted ETFs. Rather than holding just the front month contract, GCC "averages" its position in each commodity over the nearest six deliveries in an attempt to minimize contango drag. When the Bureau of Labor Statistics analyzed price movements in four commodities-crops, animal slaughter and processing, dairy, and oil and gas-only the petroleum products substantially contributed to inflation.