MBS, are eligible to be traded in the "to-be-announced", or "TBA" market. Conforming loans The GSEs are allowed to buy only conforming loans, which limits secondary market demand for non-conforming loans. The relationship between supply and demand typically renders the non-conforming loan harder to sell (fewer competing buyers); thus it would cost the consumer more (typically 1/4 to 1/2 of a percentage point, and sometimes more, depending on credit market conditions). OFHEO, now merged into the new FHFA, annually sets the limit of the size of a conforming loan in response to the October to October change in mean home price. Above the conforming loan limit, a mortgage is considered a jumbo loan. The conforming loan limit is 50 percent higher in such high-cost areas as Alaska, Hawaii, Guam and the US Virgin Islands, and is also higher for 2–4 unit properties on a graduating scale. Modifications to these limits were made temporarily to respond to the housing crisis, see Jumbo loan for recent events. Guarantees and subsidies No actual government guarantees The FHLMC states, "securities, including any interest, are not guaranteed by, and are not debts or obligations of, the United States or any agency or instrumentality of the United States other than Freddie Mac." The FHLMC and FHLMC securities are not funded or protected by the US Government. FHLMC securities carry no government guarantee of being repaid. This is explicitly stated in the law that authorizes GSEs, on the securities themselves, and in public communications issued by the FHLMC. Assumed guarantees There is a widespread belief that FHLMC securities are backed by some sort of implied federal guarantee and a majority of investors believe that the government would prevent a disastrous default. Vernon L. Smith, 2002 Nobel Laureate in economics, has called FHLMC and FNMA "implicitly taxpayer-backed agencies". The Economist has referred to "the implicit government guarantee" of FHLMC and FNMA. The then director of the Congressional Budget Office, Dan L. Crippen, testified before Congress in 2001, that the "debt and mortgage-backed securities of GSEs are more valuable to investors than similar private securities because of the perception of a government guarantee." Federal subsidies The FHLMC receives no direct federal government aid. However, the corporation and the securities it issues are thought to benefit from government subsidies. The Congressional Budget Office writes, "There have been no federal appropriations for cash payments or guarantee subsidies. But in the place