Anderson made the case that the more locally deployed capital was, the higher the return, and contrarily the more liquid it was, the lower the return.

FORBES: What Is the Liquidity Premium? What Does It Mean?

Investors find them as safe and as liquid as bank deposits, but they pay a higher return, partly because mutual funds are not burdened by the high overheads that banks bear.

ECONOMIST: Paying dividends

The iPath DJ-UBS Copper Total Return Sub-Index ETN ( JJC) is the most liquid of the exchange traded products that follow copper prices.

FORBES: 2 Ways to Play Copper's Seasonal Strength