WASHINGTON — Containers of goods idling at ports. Reduced sales at sandwich shops in downtown Washington. Canceled vacations to national parks and to destinations abroad. Reduced corporate earnings forecasts. Higher interest payments on short-term debt.

Even with the shutdown of the United States government and the threat of a default coming to an end, the cost of Congress’s gridlock has already run well into the billions, economists estimate. And the total will continue to grow even after the shutdown ends, partly because of uncertainty about whether lawmakers might reach another deadlock early next year.

A complete accounting will take months once the government reopens and the Treasury resumes adding to the country’s debt. But economists said that the intransigence of House Republicans would take a bite out of fourth-quarter growth, which will affect employment, business earnings and borrowing costs. The ripple from Washington will be felt around the globe.

“We saw huge effects during the summer of 2011, with consumer confidence hitting a 31-year low in August and third-quarter G.D.P. growing just 1.4 percent,” said Beth Ann Bovino, chief United States economist at Standard & Poor’s, referring to earlier brinkmanship over the debt ceiling. “Given that this round of debt ceiling negotiations” took place during a shutdown, she said, “the impact on the economy could be even more severe.”