And the risk of manipulation of food commodity prices has a big impact on a lot of people, some of them very vulnerable to fluctuations.

BBC: Setting prices crudely

Actions such as selling credit default swaps based on rotten loans, money laundering, interest rate manipulation, and excessive risk-taking can be as objectively determined as financial restatements.

FORBES: It Is Time For Real Bank Clawbacks

A. Hayek long ago pointed out the dangers of monetary manipulation to underprice credit and encourage risk taking.

FORBES: The Federal Reserve's Flawed Approach To Monetary Policy

The risk: exposing the market to political manipulation.

FORBES: Magazine Article