"But structuralists see it very differently. The bursting of the housing bubble caused the current crisis, but the underlying problem began much earlier -- in the late 1970s, when median U.S. incomes began to stall. Because wages got hit then by the double-whammy of global competition and new technologies, the typical American family was able to maintain its living standard only if women went into the workforce in larger numbers, and later, only if everyone worked longer hours.
When even these coping mechanisms were exhausted, families went into debt -- a strategy that was viable as long as home values continued to rise. But when the housing bubble burst, families were no longer able to easily refinance and take out home-equity loans. The result: Americans no longer have the money to keep consuming. When you consider that consumers make up 70 percent of the economy, the magnitude of the problem becomes apparent."