American consumers have enhanced fears of a downturn. This past week, the International Monetary Fund cited weaker consumer spending in slashing expectations for economic growth this year in the United States, from 2.9 percent to 2.3 percent. Avoiding recession will be “increasingly challenging,” the fund warned.

Orwellian lockdowns that have constrained business and life in general. The government expresses resolve in maintaining lockdowns, now affecting 247 million people in 31 cities that collectively produce $4.3 trillion in annual economic activity, according to a recent estimate from Nomura, the Japanese securities firm.

But the endurance of Beijing’s stance — its willingness to continue riding out the economic damage and public anger — constitutes one of the more consequential variables in a world brimming with uncertainty.

sanctions have restricted sales of Russia’s enormous stocks of oil and natural gas in an effort to pressure the country’s strongman leader, Vladimir V. Putin, to relent. The resulting hit to the global supply has sent energy prices soaring.

The price of a barrel of Brent crude oil rose by nearly a third in the first three months after the invasion, though recent weeks have seen a reversal on the assumption that weaker economic growth will translate into less demand.

major pipeline carrying gas from Russia to Germany cut the supply sharply last month, that heightened fears that Berlin could soon ration energy consumption. That would have a chilling effect on German industry just as it contends with supply chain problems and the loss of exports to China.

euro, which has surrendered more than 10 percent of its value against the dollar this year. That has increased the cost of Europe’s imports, another driver of inflation.

ports from the United States to Europe to China.

“Everyone following the economic situation right now, including central banks, we do not have a clear answer on how to deal with this situation,” said Kjersti Haugland, chief economist at DNB Markets, an investment bank in Norway. “You have a lot of things going on at the same time.”

The most profound danger is bearing down on poor and middle-income countries, especially those grappling with large debt burdens, like Pakistan, Ghana and El Salvador.

As central banks have tightened credit in wealthy nations, they have spurred investors to abandon developing countries, where risks are greater, instead taking refuge in rock-solid assets like U.S. and German government bonds, now paying slightly higher rates of interest.

This exodus of cash has increased borrowing costs for countries from sub-Saharan Africa to South Asia. Their governments face pressure to cut spending as they send debt payments to creditors in New York, London and Beijing — even as poverty increases.

U.N. World Food Program declared this month.

Among the biggest variables that will determine what comes next is the one that started all the trouble — the pandemic.

The return of colder weather in northern countries could bring another wave of contagion, especially given the lopsided distribution of Covid vaccines, which has left much of humanity vulnerable, risking the emergence of new variants.

So long as Covid-19 remains a threat, it will discourage some people from working in offices and dining in nearby restaurants. It will dissuade some from getting on airplanes, sleeping in hotel rooms, or sitting in theaters.

Since the world was first seized by the public health catastrophe more than two years ago, it has been a truism that the ultimate threat to the economy is the pandemic itself. Even as policymakers now focus on inflation, malnutrition, recession and a war with no end in sight, that observation retains currency.

“We are still struggling with the pandemic,” said Ms. Haugland, the DNB Markets economist. “We cannot afford to just look away from that being a risk factor.”

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