The United States Copper Index Fund(NYSEMKT: CPER) , for example, has just $2.4 million in assets under management and 1,759 average monthly volume. Many investors view copper as a stable, effective store of value, helping them to hedge against inflation risk over time. The $15,834 Social Security bonus most retirees completely overlook If you're like most Americans, you're a few years (or more) behind on your retirement savings.