The Powershares DB Commodity Index Tracking Fund ( DBC) is a widely followed and liquid ETF that tracks the changes in the Deutsche Bank Liquid Commodity Index.

FORBES: One High-Yielding Commodity Play

The bonds used in the representative sample tend to be the largest and most liquid in the index.

FORBES: An Easy Way To Add Fixed-Income To Your Portfolio

U.S. economic data due for release Wednesday includes the weekly MBA mortgage applications survey, new residential construction, the consumer price index and the weekly DOE liquid energy stocks report.

FORBES: Comex Gold Trades Near Steady; Weaker U.S. Dollar Supportive, But EU Crisis Uncertainty Limits Buying