US dollar down and commodity up? Factors to be considered

1) quantitative easing
- passed a sweeping stimulus bill, the Treasury orchestrated a private-public plan to scrub off up to $1 trillion in toxic assets from bank books, and the Federal Reserve pulled no punches with its efforts to drive short-term borrowing rates to zero and free up bank borrowing with more technical market intervention.

2) Slowing economy reduces demand. So it is not sustainable to have high commodity price.

3) Deleveraging reduce the USD supply and push dollar up.

4) Worries about the depth of the global downturn, then go for safe heaven again.