LONDON — One of the world's most vital trade arteries has been blocked by a quarter-mile-long container ship, creating a traffic jam that has ensnared over 200 vessels and could take weeks to clear.

But even before the Ever Given ran aground in the Suez Canal earlier this week, global supply chains were being stretched to the limits, making it much more expensive to move goods around the world and causing shortages of everything from exercise bikes to cheese at a time of unprecedented demand.

A prolonged closure of the key route between West and East could make matters much worse. Costly delays or diversions to longer routes will heap pressure on businesses that are already facing container shortages, port congestion, and capacity constraints.

The grounding of the Ever Given is delaying shipments of consumer goods from Asia to Europe and North America, and agricultural products moving in the opposite direction. As of Friday, some 237 vessels, including oil tankers and dozens of container ships, were waiting to transit the canal, which handles about 12 percent of global trade.

"There's been a great convergence of constraints in supply chains like I've never seen before," said Bob Biesterfeld, the CEO of C.H. Robinson, one of the world's largest logistics firms. The bottlenecks are widespread, affecting transport by air, ocean, and road, Biesterfeld told CNN Business in an interview. "It really has been unprecedented."

More than 80 percent of global trade by volume is moved by sea, and the disruptions are adding billions of dollars to supply chain costs. Globally, the average cost to ship a 40-foot container shot up from $1,040 last June to $4,570 on March 1, according to S&P Global Platts.

Those costs add up. In February, container shipping costs for seaborne US goods imports totaled $5.2 billion, compared to $2 billion during the same month in 2020, according to S&P Global Panjiva.

These expenses could soon mean higher prices for consumers, adding upward pressure to rising inflation — a nightmare scenario for Wall Street, which is already fearful that a spike in prices could force the Federal Reserve to hike interest rates sooner than expected.

"At the moment a lot of these costs are within the supply chains," said Chris Rogers, a research analyst at S&P Global Panjiva. "I think it's inevitable that it will be passed on to consumers — it's just going to take time," he added.

The coronavirus wreaked havoc on global supply chains last year, as lockdowns temporarily closed factories and disrupted the normal flow of trade. Economic activity slowed dramatically at the start of the pandemic, and the rapid rebound in trade volumes that followed caught companies off guard.

A pickup in manufacturing and seemingly insatiable demand from housebound consumers for goods such as televisions, furniture, and exercise bikes has stretched suppliers and made it difficult for consumers to find the products they'd like to buy.

Manufacturers have also struggled to secure crucial components. Major carmakers, including Ford and Volkswagen, have been forced to idle factories because of a shortage of computer chips caused by high demand for smartphones, gaming systems, and other tech gadgets.

"One year ago, global trade slowed to a crawl as the Covid-19 pandemic first hit China and then spread worldwide," Gene Seroka, executive director at the Port of Los Angeles, said in a presentation this month. "Today, we are in the seventh month of a historic import surge, driven by unprecedented demand by American consumers," he added.

US seaborne imports were nearly 30% higher in February than the same month last year and 20 percent up on February 2019, according to S&P Global Panjiva.

The import surge in the United States and elsewhere has led to a worldwide container shortage. Everything from cars and machinery to apparel and other consumer staples are shipped in these metal boxes. The factories that make them are mostly in China and many of them closed early in the pandemic, slowing down the rate at which new capacity was coming on stream, according to Rogers.

Containers are in all the wrong places

China's exports recovered fairly quickly compared to the rest of the world. At the same time, major shipping lines had canceled dozens of sailings to respond to the earlier lull in trade. The result was that empty containers piled up in all the wrong places and couldn't meet the sudden demand in Europe and North America for Asia-made goods.

Hapag-Lloyd (HPGLY), one of the world's largest container shipping lines, has deployed about 52 additional vessels just to move hundreds of thousands of empty containers to where they're needed most. In more normal times, there would be fewer than 10.

"That's in reality about a ship a week that's doing nothing more than moving empty containers," CEO Rolf Habben Jansen told investors on a call last week. — Courtesy CNN