Citi Warns Economic Collapse 2017. Citi now joins the other major banks in warning the U.S. Stock market is heading for major crash. The Last Time We saw This Was 2008 and the dot com bubble burst. The Stock Market looks to be heading into the end of the current business cycle. Citi states they keep hearing the same question is the market set to crash it was a clear and present warning on the market valuation. lending has collapsed what follows is stock market collapse.