The content originally appeared on: CNN This story is part of CNN Business' Nightcap newsletter. To get it in your inbox, sign up for free, here. New York CNN Business - All week, there have events in the news that have come in under of the banner of 'this hasn't happened since 2007/2008.' Yields on the 10-year Treasury briefly surpassed 4%, a level not seen since 2008. That movement helped push mortgage rates to their highest level, 6.7%, since - […]