WHAT are the most dysfunctional parts of the global financial system? China’s banking industry, you might say, with its great wall of bad debts and state-sponsored cronyism. Or the euro zone’s taped-together single currency, which stretches across 19 different countries, each with its own debts and frail financial firms. Both are worrying. But if sheer size is your yardstick, nothing beats America’s housing market.
It is the world’s largest asset class, worth $26 trillion, more than America’s stockmarket. The slab of mortgage debt lurking beneath it is the planet’s biggest concentration of financial risk. When house prices started tumbling in the summer of 2006, a chain reaction led to a global crisis in 2008-09. A decade on, the presumption is that the mortgage-debt monster has been tamed. In fact, vast, nationalised, unprofitable and undercapitalised, it remains a menace to the world’s biggest economy 

Unreal estate
The reason the danger passes almost unnoticed is that, at first sight, the housing market has been improving. Prices in America have crept back up towards their all-time high. As a result, the proportion of households with mortgage debts greater than the value of their property has dropped from a quarter to under a tenth. In addition, while Europe has dithered, America has cleaned up its banks. They have $1.2 trillion of core capital, more than double the amount in 2007, which acts as a buffer against losses. The banks have cut risk and costs and raised fees in order to grind out decent profits. Bosses