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New York. Economists and analysts are trying to gauge the costs to the economy and consumers if the United States loses its solid-gold credit rating — a move that appears more likely now that the standoff in Washington over government spending has calcified.

Some economists say the effects of lowering the federal government’s credit rating to AA from AAA can be measured in the billions of dollars in increased borrowing costs for the government, and in the billions more that consumers, corporations, states and municipalities will have to pay for their credit. It could also erode consumer and business confidence, slowing even further the economy and job creation.

The prospect of a downgrade by one of the credit rating agencies once seemed almost unimaginable. But the impasse in Washington over the government’s deficit and $14.3 trillion debt limit has led some global financial players to expect the change. A downgrade on debt issued by the United States would have less severe consequences than a default, which takes place when a government fails to pay its creditors.

Many Wall Street bankers on Tuesday said they still believed a default would be avoided because its consequences for the markets and economy could be catastrophic. They were less certain, however, what the cumulative effect might be of a downgrade.

The view among many on Wall Street on Tuesday was that long-term Treasury yields could edge up by 0.10 percentage point, to 0.70 percentage point. That would eventually increase the amount of interest the United States pays on its debt by as much as tens of billions of dollars each year. The government now pays $250 billion a year on interest costs to service its debt.

The size of the increase depends on how long the stalemate in Washington continues, Terry Belton, the global head of fixed-income strategy at JPMorgan Chase, said on Tuesday. On the high end, the government’s interest payments could climb an additional $100 billion a year, Belton said. “That is a huge number, representing a long-term permanent increase in US borrowing costs.”

Rates would also increase on some markets priced off Treasuries, including mortgages, credit cards and student and auto loans, analysts warned. For a typical consumer with a $200,000 mortgage, the increase in yields could translate into an increase of $200 to $400 a year in their loan payments, according to Citigroup analysts.

Treasuries are also widely held as collateral in the huge repurchase markets that are used by banks around the world to raise overnight loans, and in clearing houses for financial derivatives. If Treasuries decline in value, participants could be asked to put up more collateral, which could cause selling across a broad swath of the markets.

Mohamed El-Erian, the chief economist at the investment firm Pimco, said he believed lawmakers would reach an agreement to raise the debt ceiling and avert a default on the country’s debt, but that the nation’s rating would remain vulnerable.

“A downgrade would mean a weaker dollar, somewhat higher interest rates and a further blow to the already fragile national economic confidence,” El-Erian said. “This translates into weaker growth and even greater headwinds when it comes to job creation, which is absolutely critical at this stage.”

Standard & Poor’s, one of the three major ratings agencies, has said that just raising the debt ceiling would not be enough. Without a “credible” plan by Congress for at least $4 trillion in savings, the agency has warned, the US credit rating might still be downgraded.

Analysts and economists pointed to that stance this week when they expressed growing concerns about a downgrade.

On Monday, some of the country’s largest state pension funds sent a letter to President Barack Obama and Congress, warning that “the fallout will be felt all across America” and that economic growth “will stall for years to come.”

The New York Times