Stock-market investors rarely see a recession coming despite warning signals. As all the classic alarm bells ring again, this time is no different, experts say — setting investors up to get crushed.

Stock-market investors rarely see a recession coming despite warning signals. As all the classic alarm bells ring again, this time is no different, experts say — setting investors up to get crushed.

Right up until the economy enters a recession, there are always those who argue that we will avoid a…