Why we should care about global inequality?

If knowing that you sit comfortable in an air conditioned room reading this blog when over 1 billion people in the world are malnourished and hungry isn't enough of a reason to care about global inequality, it will be difficult to engage you further on this subject. But if the simple fact of knowing that many many human beings just like yourself live on a dollar or less a day and don't have running water or a place to take care of their necessities is not enough, I think you should at least consider that investing in developing countries will help our economy as well. If the current populations in developing countries had better nutrition, better education, and higher income, we'd have a whole new market of consumers who would want to buy our products, thus contributing to our economic success.