Commodity Update: Is The Summer Slump Over? By: TalkMarkets October 04, 2016 at 16:06 PM EDT In Q3, commodities as a whole entered a “summer slump”, returning -5.7% as measured by the GSCI (Goldman Sachs Commodity Index). Read More >> Related Stocks: Coal ETF Vaneck GX Uranium ETF Physical Palladium ETF Physical Platinum ETF SPDR GOLD Silver Trust Ishares Teucrium Corn Teucrium Soybean Teucrium Wheat United States Oil Fund iPath Dow Jones-Goldman Sachs Crude Oil Fund