http://money.cnn.com/2008/01/29/news/economy/stimulus_analys...
If you take all the money (100%) from people who build and make things and give it to people who don't have jobs to spent, in the short term things will be bought and everything thing will appear stimulated. In the long run your entire economy will collapse as your capital base erodes. The basic Keynesian error is to not distinguish between purely consumptive (why don't create jobs to build ships, fill them full of gold and new technology, and then drive them into the Pacific and sink them?) and productive goods which actually build economic wealth and raise the standard of living.
My own wholly unfounded reasoning goes as this: give a broke guy some food stamps, he'll spend it on food. So the government is essentially buying this guy food. Food and groceries happen to be some of the the lowest-margin sectors of the economy - Safeway's operating margin hovers a little under 3%. So yeah, the guy will spend it right away, but you're not making much money out of this. The broke guy just wants to feed himself.
Give that same money to someone who's actively trying to make more money out of it (e.g, a business), they have much more incentive to use it efficiently.
I'm a SF liberal, I totally believe feeding the poor should have government support. But it makes a poor economic argument to me.
Safeway's doesn't have a huge margin, but so what? They employ people directly and indirectly: cashiers, truckers, stock clerks, people who work in canneries, farmers, chemists who formulate fertilizers, etc. It isn't as if a dollar spent at Safeway's ends up in an incinerator while a dollar spent at Apple mates with another dollar to make change.
Lets assume he is dirt poor, rather than broke. Everyone needs food and groceries. If he spends the food-stamps on food, he will likely spend the money that he would have spent on groceries on something else. By giving food stamps, you've given him a surplus of money, so he'll buy something that he needs but can do without, or a luxury good that he wants.
Lets assume now he is rich. We give him a tax break equivalent to the food-stamps (or even the same food stamps). He's already buying everything he wants and putting some in the bank. With the food stamps, he is able to put more in the bank. If the money is in the bank, it can be loaned to the poor guy, but it is actually (eventually) taking money out of the economy when it is loaned... the poor guy has to eventually pay it back to the bank with a few % interest.... it isn't actually getting 'spent' on anything.
Meanwhile if you give it to a more profitable business, they'll make much more out of it. We're not pissing around stimulus dollars to feed poor people or make them richer. We want to increase the total amount of value in the economy.
Your now-he-can-buy-luxuries argument is bullshit. Great, let the government subsidize iPads, that'll get the economy going.