Roubini, a respected but formerly obscure academic, has become a major figure in the public debate about the economy: the seer who saw it coming. He has been summoned to speak before Congress, the Council on Foreign Relations and the World Economic Forum at Davos. He is now a sought-after adviser, spending much of his time shuttling between meetings with central bank governors and finance ministers in Europe and Asia. Though he continues to issue colorful doomsday prophecies of a decidedly nonmainstream sort — especially on his popular and polemical blog, where he offers visions of “equity market slaughter” and the “Coming Systemic Bust of the U.S. Banking System” — the mainstream economic establishment appears to be moving closer, however fitfully, to his way of seeing things.

The ’90s were an eventful time for an international economist like Roubini. Throughout the decade, one emerging economy after another was beset by crisis, beginning with Mexico’s in 1994. Panics swept Asia, including Thailand, Indonesia and Korea, in 1997 and 1998. The economies of Brazil and Russia imploded in 1998. Argentina’s followed in 2000. Roubini began studying these countries and soon identified what he saw as their common weaknesses. On the eve of the crises that befell them, he noticed, most had huge current-account deficits (meaning, basically, that they spent far more than they made), and they typically financed these deficits by borrowing from abroad in ways that exposed them to the national equivalent of bank runs. Most of these countries also had poorly regulated banking systems plagued by excessive borrowing and reckless lending. Corporate governance was often weak, with cronyism in abundance.

But most important, in Roubini’s opinion, is to realize that the problem is deeper than the housing crisis. “Reckless people have deluded themselves that this was a subprime crisis,” he told me. “But we have problems with credit-card debt, student-loan debt, auto loans, commercial real estate loans, home-equity loans, corporate debt and loans that financed leveraged buyouts.” All of these forms of debt, he argues, suffer from some or all of the same traits that first surfaced in the housing market: shoddy underwriting, securitization, negligence on the part of the credit-rating agencies and lax government oversight. “We have a subprime financial system,” he said, “not a subprime mortgage market.”