For the commodity sleeve of our portfolio, we would look to either PowerShares DB Commodity ( DBC ) or United States Commodity Index ( USCI ). DBC is actually the largest and most liquid broad commodity ETP on the market. Historically, investors have allocated portions of their portfolios to real estate, inflation-linked bonds, gold, and instruments tracking a broad basket of commodities in an effort to preserve purchasing power in the event of an unexpected inflationary shock.