Thanks, Fred. I think you've helped me out before. I appreciate your
effort.

I've put the relevant code here: http://pastie.org/1100297

So you know what's happening, the farmer creates a Production, which
creates one or more Supplies, which may create one or more Exchanges
if there are any Demands that match the Supply.

The Exchange is supposed to decrement the "available" variable in both
the Supply and Demand models (the "quantity" variable doesn't change).

On exchange.rb#18 where the debugger stops, the values of
demand.available and supply.available have been correctly decremented.
After I let the code continue, they are back to their original values.

Thanks again.

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