<prompt> Human: Recently my father has been attempting to predict downturns in the stock market by cashing out his retirement funds into cash, before re-entering the market a few weeks later when he believes the market will begin to rise again. So far I believe he has done this multiple times, and has been doing a poor job at maintaining good predictions, losing upward of 10k, when he sold at the start of year dip, and bought in right after it bounced back.I was wondering if anyone could give me some advice as to how I would convince him that this is a bad strategy. I have tried to have a conversation with him multiple times about it, but he has shrugged me off each time, believing that in the long run hes going to make money.Assistant: I was wondering if anyone could give me some advice as to how I would convince him that this is a bad strategy.If this didnt do it:losing upward of 10kIts not clear what anyone else could possibly say to him. Is he entirely in control of his faculties or is it time for him to have someone else tend to his financial affairs?Human: Im fairly confident hes trumped that loss up to bad luck and believes that next time is going to be different. Hes got a very strong superiority complex and believes himself to be very intelligent.  <response>: I started wondering, if there was an ETF for everything why isnt there one that does market timing for you? Then I found it. Its called HTUS. It launched a few years ago.Heres how its done over the past year against the SP and Vanguards 2045 target date.Over the past year, they lost money despite the 15 gains. Go back further, and they dont always lose overall, but they do lose to the rest of the market. These are the so called professionals... and all they managed to do by market timing was lose money. Try showing him that one. 