Generosity

Can you be generous if you don't value things as highly as other people do? I sometimes think I'm more generous than some people, but maybe I just don't value the things that I give so freely as much as they do. Time for instance. I'm almost always willing to spare my time and energy, but is that more generous than the few minutes a busier friend can grant me? It isn't that I don't value my time though, but I know I'm not as practical as my friends. And what are these busy people doing that makes their time so valuable? It's all very mysterious.