Hasn't it been rather conclusively shown that by stimulating spending food stamps ultimately make money for the government -- that is to say, more tax revenue as a result of food stamps comes in than is spent on food stamps? Or am I confusing this with something else?
That doesn't sound right. The only way I can think of that would be the case is by food stamps giving people the energy they need to go out and get jobs - which is possible, but not something you could measure. Reductions in spending in areas affected by malnourishment is also possible - but again, I don't see any way to measure this.