People who don't think there's a bubble focus on the very real differences between the 1990s and now. People who think there is a bubble focus on the patterns

People who don't think there's a bubble focus on the very real differences between the 1990s and now. People who think there is a bubble focus on the patterns that are similar to the 1990s and past bubbles -- including how the optimists always say "it's all different this time."