If you haven't read either one yet, I suggest Ayn Rand's "Anthem", and if you liked that, "Atlas Shrugged". Anthem is a bit more difficult to locate, but worth the effort. Atlas Shrugged is an excellent book, although a bit tedious in a few places. After reading that one a couple of years ago, I consider Rand a prophet or a clairvoyant, because everything she wrote about is coming true.