<prompt> Human: My husband invested in a Vanguard 500 Index Fund mutual fund on Jan 26, the day that the SP 500 was at its highest. This is not a huge problem but he has never invested in a mutual fund before and did it on my encouragement. I am happy that I encouraged him to invest but he often reflects that he should take out the funds and save it until the stock market moves back up or until there is some stabler economic times ie Trumps tariffs, etc. I am having a hard time explaining that this would not be a wise move but he insists that he lost money and will only continue to lose money since he invested at the peak. I could use some advice on articles or concepts that explain why he should keep the funds there. Or am I completely wrong and he should take it out? Any advice is helpful. Update: Hey all I really appreciated everyones links and suggestions. Thank you!  <response>: he often reflects that he should take out the funds and save it until the stock market moves back upThis is literally Buy High, Sell Low... aka the exact opposite of what anyone and everyone in personal finance would recommend.Why keep it in there? How about this? 