This meant that nearly one-third of the U.S. lending mechanism was frozen and continued to be frozen into June 2009. According to the Brookings Institution, the traditional banking system does not have the capital to close this gap as of June 2009: "It would take a number of years of strong profits to generate sufficient capital to support that additional lending volume". The authors also indicate that some forms of securitization are "likely to vanish forever, having been an artifact of excessively loose credit conditions". While traditional banks have raised their lending standards, it was the collapse of the shadow banking system that is the primary cause of the reduction in funds available for borrowing.