Overview
You can share your feelings and opinions today, but don't share your resources. If a friend forgot their wallet, offer them some of your lunch -- but don't offer to buy them their own. It's not about being selfish or mean -- it's about avoiding setting any precedents. Make sure you draw proper boundaries between you and the rest of the world. And when it comes to money or time, you should draw them all the more blatantly -- for your own protection.