Today I learned the word "rivalrous", which means "emulous", or "eager to surpass others". Resources that cannot be shared are rivalrous.
I also picked up three long-time favourite classics of economics: The Marx-Engels Reader; de Tocqueville's Democracy in America; and Mr Adam Smith's "truck, barter, and trade" (the po-mo title of "On The Wealth of Nations").
Outside of a dog, a man's best friend is a book. Inside of a dog, it's too dark to read.