The mortgage markets of America are on the verge of nationalization. Fannie Mae, Freddie Mac, and the Federal Home Loan Bank System (all government-sponsored enterprises, or GSEs) have become giants in the mortgage markets. The Big Three have grown at such a rapid rate over recent years that at the end of 2000, they collectively held $2.9 trillion of mortgage debt, which was equivalent to nearly 56 percent of all US household mortgage debt. Combined, they account for 90 percent of the total federal agency debt, and federally sponsored agency debt outstanding at the end of 2000. In 2001, the growth of GSEs did not abate.