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How does giving to charity work?
I'll answer your second question: it depends what your charity is for. There are two types: i) Emergency (i.e. to respond to environmental or social disasters where it acts a bit like an insurance policy); ii) Development (i.e. where the intention is to subsidise something missing in the local economy); A lack of insurance is certainly a problem for people who lose their homes and livelihoods to disaster.  Your donations can go far. As for development aid: "We find little evidence of a robust positive correlation between aid and growth," write two ex-IMF economists, Raghuram Rajan, who stepped down as IMF chief economist at the end of 2006, and Arvind Subramanian, who left the IMF this year. "One of the most enduring and important questions in economics is whether foreign aid helps countries grow ... There is a moral imperative to this question: it is a travesty for so many countries to remain poor if a relatively small transfer of resources from rich countries could set them on the path to growth ... But if there is no clear evidence that aid boosts growth, then handing out more money makes little sense," they conclude. I do somewhat further in declaring that charity is equivalent to trade dumping.  By artificially lowering the real cost of a particular good it ensures that there will be no local investment in that good.  Free clothes to Africa has destroyed the local textiles industry.  Free doctors has resulted in more African doctors in New York than in the whole of Africa. So decide where your charity is going: emergencies or development?  Then decide what you can afford.  But your first investment should always be in yourself.  If by making use of that investment you can benefit the economy and keep others around you employed and productive you will achieve far more.