A reader asks:What do you do if this is a bubble? Sit it out? And maybe miss 2-3 years of 30% gains before it gets cut by 70%? I mean I think it’s too costly not to be in the game if your horizon is 8 plus years. I think I’m going to let my money sit. I’m 35. If this isn’t a bubble, timing it means missing out on significant gains in my portfolio. If it is a bubble, I’ll just keep shoveling money in. If I were older, I’d probably be more worried.Here’s something I wrote in Everything You Need to Know About ...