let the customer decide on food vs fuel

What if that results in the wealthy getting both and everyone else getting neither?

What if that results in the wealthy getting both and everyone else getting neither?
Could be, though more likely to be the landowning classes http://www.aboutbioenergy.info/benefits.html
A variant of this is already happening in the developing world: cash crops for international markets (tobacco, cotton, coffee, etc.) being favoured over food for the national/regional market.  
The consensus in Eastern Arkansas-The Delta, is that cotton
will be planted turnrow to turnrow (meaning, everywhere possible).

Corn and rice will be cut back-at least 20%, with soybeans
(no fertilizer needed)filling the gaps.

James