In order to address problems related to the subprime mortgage crisis and United States housing bubble, several new tools have been created. The first new tool, called the Term Auction Facility, was added on December 12, 2007. It was first announced as a temporary tool but there have been suggestions that this new tool may remain in place for a prolonged period of time. Creation of the second new tool, called the Term Securities Lending Facility, was announced on March 11, 2008. The main difference between these two facilities is that the Term Auction Facility is used to inject cash into the banking system whereas the Term Securities Lending Facility is used to inject treasury securities into the banking system. Creation of the third tool, called the Primary Dealer Credit Facility (PDCF), was announced on March 16, 2008. The PDCF was a fundamental change in Federal Reserve policy because now the Fed is able to lend directly to primary dealers, which was previously against Fed policy. The differences between these three new facilities is described by the Federal Reserve: