On Patents and the Tragedy of the Anti-Commons

Opportunities forgone aren’t always easy to see. The effects of overuse are generally unmistakable—you can’t miss the empty nets of fishing boats working overfished oceans, or the scrub that covers an overgrazed field. But the effects of underuse created by too much ownership are often invisible. They’re mainly things that don’t happen: inventions that don’t get made, useful drugs that never get to market. -- James Surowiecki