I don't think that Tim Cook has the power to "really change the world" by donating money. He's not a billionaire, so presumably he'll be giving away less than

I don't think that Tim Cook has the power to "really change the world" by donating money. He's not a billionaire, so presumably he'll be giving away less than $1 billion. That's certainly two, and maybe three, orders of magnitude less than is necessary to make really noticeable changes on the scale of the world or even a large country in the world -- even if his money can be used efficiently. If you gave $1 billion to the bottom 10% of just Americans, they'd each get around $33. This isn't to detract from charitable giving, or from Cook. It's admirable that he's doing it. But let's not underestimate the scale of the problems of the world, either.