We live in a world that venerates "ideas" but ignores the fact that even the best idea is worthless if it's poorly executed. In turn, people who "copy" ideas are often demonized, even when it's their superior execution that is responsible for their success. But the truth is that copying is a critical part of innovation and progress, and the instinct to ignore or refute that idea has left us without many clear measurements of its impact — not to mention lots of bad policy, and a highly problematic "ownership culture" when it comes to ideas and creative output.