The Size Conundrum: Why Online Knowledge Markets Can Fail at Scale

Why did Yahoo Answers fail? Why is Stack Overflow declining? Will Quora survive in 2020?

Introduction to CDL

Spending less time stuck in traffic, living in cities with little or no pollution, or leading healthy lives are outcomes that most of us would like. Achieving these outcomes, requires that people cooperate on their actions. For example, If everyone decides to use the same major expressway at the same time to get to work, they would experience congestion, the opposite of their individual goal. Similarly, if fewer people paid attention to the food that they ate and didn’t exercise, we would see more unhealthy people in the long run, increasing health costs for all.