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The last global economic crisis, for all its complex detail, had one big, simple cause: A huge housing and debt bubble had emerged in both the United States and Europe, and it took the world economy down when it deflated.

The previous, milder recession, in 2001, also had a single cause: the bursting of a bubble in technology stocks and investment.

But the slump before that, in 1990-91, was a messier story. It was a smorgasbord recession — a downturn with multiple causes, ranging from the troubles of savings and loan institutions, to a glut of office buildings, to falling military spending at the end of the Cold War.

The best guess is that the next downturn will similarly involve a mix of troubles, rather than one big thing. And over the past few months we've started to see how it could happen. It's by no means certain that a recession is looming, but some of our fears are beginning to come true.

Right now, I see four distinct threats to the world economy.

China: Many people, myself included, have been predicting a Chinese crisis for a long time — but it has kept not happening. China's economy is deeply unbalanced, with too much investment and too little consumer spending; but time and again the government has been able to steer away from the cliff by ramping up construction and ordering banks to make credit ultra-easy.

Trouble in China would have worldwide repercussions. We tend to think of China only as an export juggernaut, but it's also a huge buyer of goods, especially commodities like soybeans and oil; U.S. farmers and energy producers will be very unhappy if the Chinese economy stalls.

Europe: For some years Europe's underlying economic weakness, due to an aging population and Germany's obsession with running budget surpluses, was masked by recovery from the euro crisis. But the run of good luck seems to be coming to an end, with the uncertainty surrounding Brexit and Italy's slow-motion crisis undermining confidence; as with China, recent data are ugly.

Europe is a big player in the world economy, so its stumbles will spill over to everyone, the U.S. very much included.

Trade war: Over the past few decades, businesses around the world invested vast sums based on the belief that old-fashioned protectionism was a thing of the past. But Donald Trump hasn't just imposed high tariffs, he's demonstrated a willingness to violate the spirit, if not the letter, of existing trade agreements.

For now, corporate leaders reportedly believe that things won't get out of hand, that the U.S. and China in particular will reach a deal. But this sentiment could turn suddenly if and when business realizes that the hardliners still seem to be calling the shots.

The shutdown: It's not just the federal workers who were not getting paid. It was also the contractors, who never will get reimbursed for their losses, the food stamp recipients who were cut off, and more. Conventional estimates of the cost of the shutdown were almost surely too low, because they didn't take account of the disruption a nonfunctioning government imposes on every aspect of life.

The good news is that even taking all those negatives together, they don't come close to the body blow the world economy took from the 2008 financial crisis. The bad news is that it's not clear what policymakers can or will do to respond when things go wrong.

Dealing effectively with any kind of global slump requires a lot of international cooperation. How plausible is that given who's currently in charge?

Again, I'm not saying that a global recession is necessarily about to happen. But the risks are clearly rising: The conditions for such a slump are now in place, in a way they weren't even a few months ago.

The New York Times

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