This statement is (likely) unfalsifiable. That is, it would have to come from someone who does this successfully, and could offer up some evidence of having don

This statement is (likely) unfalsifiable. That is, it would have to come from someone who does this successfully, and could offer up some evidence of having done it, and what system and logic they use to understand the economy and thus know when equities are high and low, when to sit on the sidelines, etc. Few people doing so well would share such a process, but in theory, if they did, and it worked, it would likely trigger a flood of followers, and the behavior of the markets would shift alongside it. Presumably someone making this claim is a billionaire. Or they've being doing well in stocks for a short enough time that it's yet to be proven if they are as good at timing the markets as they think they are.