NEW YORK (NYTIMES) - For the past three decades, companies and consumers benefited from cross-border connections that kept a steady supply of electronics, clothes, toys and other goods so abundant it helped prices stay low.

But as the Covid-19 pandemic and the war in Ukraine continue to weigh on trade and business ties, that period of plenty appears to be undergoing a partial reversal. Companies are rethinking where to source their products and stocking up on inventory, even if that means lower efficiency and higher costs. If it lasts, such a shift away from fine-tuned globalisation could have important implications for inflation and the world's economy.

Economists are debating whether recent supply chain turmoil and geopolitical conflicts will result in a reversal or reconfiguration of global production, in which factories that were sent offshore move back to the United States and other countries that pose less of a political risk.

If that happens, a decades-long decline in the prices of many goods could come to an end or even begin to go in the other direction, potentially boosting overall inflation.

Since around 1995, durable goods such as cars and equipment have tamped down inflation, and prices for non-durable goods like clothing and toys have often grown only slowly.

Those trends began to change in late 2020 after the onset of the pandemic, as shipping costs soared and shortages collided with strong demand to push car, furniture and equipment prices higher. While few economists expect the past year's breakneck price increases to continue, the question is whether the trend towards at least slightly pricier goods will last.

The answer could hinge on whether a shift away from globalisation takes hold.

"It would certainly be a different world - it might be a world of perhaps higher inflation, perhaps lower productivity, but more resilient, more robust supply chains," Mr Jerome Powell, the Federal Reserve chair, said at an event last month when asked about a possible move away from globalisation.

Still, Mr Powell said, it is not obvious how drastically conditions will change. "It is not clear that we are seeing a reversal of globalisation," he said. "It is clear that it has slowed down."

The period of global integration that prevailed before the pandemic made many of the things Americans buy cheaper. Computers and other technology made factories more efficient, and they chugged out sneakers, kitchen tables and electronics at a pace unmatched in history. Companies slashed their production cost by moving factories offshore, where wages were lower. The adoption of steel shipping containers, and ever larger cargo ships, allowed products to be whisked from Bangladesh and China to Seattle and Tupelo, Mississippi, and everywhere in between for astonishingly low prices.

But those changes also had consequences for US factory workers, who saw many jobs disappear. The political backlash to globalisation helped carry former president Donald Trump into office, as he promised to bring factories back to the US. His trade wars and rising tariffs encouraged some companies to move operations out of China, although typically to other low-cost countries like Vietnam and Mexico.

The pandemic also exposed the snowball effect of highly optimised supply chains: Factory shutdowns and transport delays made it difficult to secure some goods and parts, including semiconductors that are crucial for electronics, appliances and cars. Shipping costs have soared by a factor of 10 in just two years, erasing the cost savings of making some products overseas.

Inflation has only accelerated since. Russia's invasion of Ukraine has further snarled supply chains, raising the prices of gas and other commodities in recent months and helping to push the Fed's closely watched inflation index up 6.6 per cent over the year till end-March.

That is the fastest pace of inflation since 1982, and price gains are touching the highest level in decades across many advanced economies, including the euro zone and Britain.

Many economists expect price increases for durable goods to cool substantially in the months ahead, which should help calm overall price gains. Data from March suggested that they were beginning to moderate. Rising Fed interest rates could help temper buying, as borrowing to buy cars, machines or home improvement supplies becomes more expensive.

But there are still questions about whether - in the light of what companies and countries have learnt - major products will return to the steady price declines that were the norm before the coronavirus.

It is not clear yet to what extent factories are moving closer to home. A "reshoring index" published by Kearney, a management consulting firm, was negative in 2020 and 2021, indicating that the US was importing more manufactured goods from low-cost countries.

But more firms reported moving their supply chains out of China to other countries, and American executives were more positive about bringing more manufacturing to the US.

Long-run population changes could also compound the effects of a slowdown or pullback in globalisation, pushing up prices by making labour more expensive. By 2050, one in six people worldwide will be older than 65, according to United Nations estimates, up from one in 11 in 2019.

"Demography and the reversal of globalisation mean that a great deal of it is likely to be permanent - clearly not all," London School of Economics emeritus professor Charles Goodhart said of pandemic-era price and labour issues. Prof Goodhart co-wrote a book in 2020 arguing that the world was on the cusp of a demographic reversal.

"There will be structural forces raising inflation for probably the next two to three decades," he said.

Some disagree. Dr Adam Posen, president of the Peterson Institute for International Economics, pointed out that plenty of workers were available in parts of South Asia, Africa and Latin America. And inflation has been weak in Japan for decades, despite its much older population.

Nor would a decline in globalisation necessarily add to inflation in the long run, he said. By slowing growth, it could lead to less demand and price increases.

But the intertwined trajectory for globalisation, goods prices and inflation on the whole will be one that economists watch closely.

"People used to say it is the million-dollar question but I guess these days, it is the billion- or trillion-dollar question," said Associate Professor Carlos Viana de Carvalho, a former New York Fed economist.

It is possible but not definite, he said, that the world is moving into a new economic era marked by higher inflation amid the changes to global integration and intensifying climate concern.

"These things are very hard to identify in real time," he said.