<prompt> Human: So, for the past 2 years, Ive had a very aggressive, securities-centered investment plan with my 401K. I am 31 years old, and plan to retire in 2045. We have a lot of options to choose from, and I specifically chose plans with aggressive growth strategies, and its paid off quite well. Ive seen an almost 30 across the board growth this year alone, and Im feeling quite good about it.However, lately Ive come to understand that many economists believe that we are in a securities bubble, fueled by QE by the Fed, and that there is a feeling we may be in for a nasty surprise or at the very least a sharp correction.Today I pulled about 80 of my assets out of securities and put them into super-boring, slow growth gov assets. Basically a plan designed to grow super-slow with almost zero risk.I dont want to be short-sighted with my 401K, but I felt like locking in gains for a few months to reevaluate the market, specifically since my returns have been so good. Is this dumb with a retirement account, or am I being unnecessarily cautious? Ive seen really great returns on my investments on my first ever attempt to more actively manage my accounts, and Id hate to see it go the way of 2008. My fees, etc, related to the switch are minimal. I plan to re-enter a more aggressive strategy slowly, barring a correction.Too cautious?  <response>: Others have addressed the mistakes youre making with your asset allocation, ranging from market timing to an unnecessarily conservative choice of fund balances.I want to address this: However, lately Ive come to understand that many economists believe that we are in a securities bubble, fueled by QE by the Fed, and that there is a feeling we may be in for a nasty surprise or at the very least a sharp correction.No, they dont. Lets start with this: if there was a sharp correction expected by real economists as opposed to people looking for pageviews by shouting doom and gloom, itd already be incorporated into the prices. There are a lot of - lets call them what they are, bullshit - conspiracy theories about the Fed and the like. Even if you wanted to act on news about it and things like that - and, if the news had value, youre probably acting too late on it _anyway_ - stick to facts, not nonsense.Theres a very simple test for this: whats more likely: the nations top economists know what theyre doing or some website you read has something figured out in the economics realm that the top researchers and practitioners in the field dont? 