Writing on his blog, Krugman, somewhat half-serious, suggests that if the Republicans, who are looking for spending cut pledges to tackle the debt, would be willing to force America into default by refusing to vote to raise the debt ceiling, U.S. President Barack Obama should be willing to take this step.
"He will, after all, be faced with a choice between two alternatives: one that’s silly but benign, the other that’s equally silly but both vile and disastrous. The decision should be obvious," he wrote.
The debt ceiling is the government's borrowing limit that can only be raised through congressional authorization.
Krugman notes that a legal loophole allows the Treasury to mint platinum coins in any denomination it chooses. By minting a $1-trillion coin, then depositing it at the Federal Reserve, "the Treasury could acquire enough cash to sidestep the debt ceiling — while doing no economic harm at all," Krugman wrote.
Inspires Twitter hashtag
And Krugman isn't the only one raising the idea. New York Democratic congressman Jerry Nadler has expressed support for it and a formal White House petition has been started, as has a Twitter hashtag (#Mintthecoin).
But is this a plausible course of action?
"The platinum coin is a silly, but elegant, solution to a silly problem," Mike Moffatt, assistant economics professor at Western University's Richard Ivey School of Business, wrote in an email to CBC News. "The platinum coin proposal gives the Obama administration an alternative if House Republicans are completely intransigent on the debt ceiling issue."
Antony Davies, an economics professor at Pittsburgh's Duquesne University, took a dimmer view. He said minting a trillion-dollar coin is the same as printing money, and is all part of the "money illusion."
"Money illusion is the [false] belief that one is better off when one has more money," he wrote in an email to CBC News. "It certainly sounds reasonable until we distinguish between 'money' and 'purchasing power.'"
For example, he said that if the government announced that everyone was to add a zero to their money, every dollar bill would become a 10, just as $1,000 in a chequing account, would become $10,000.
"Would you be better off? The answer is no. All that would happen is that businesses would add a zero to their prices. A 75 cent hamburger would cost $7.50," Davies said.
Printing money causes inflation
What makes money valuable, he said, is the goods and services money buys.
"Minting a trillion-dollar coin doesn’t change the amount of goods and services. Therefore, all the trillion-dollar coin does is to take the value of existing goods and services and spread it around a larger number of dollars – thereby making each dollar worth less. We call this inflation. Printing more money [or minting more coins] simply causes inflation."
Moffatt agreed that if there was no response from the Federal Reserve, the trillion-dollar coin move would be inflationary. But he said the Fed would almost certainly respond by taking an equal amount of money out of the economy, by selling some of the large inventory of bonds.
This, in technical terms, would "sterilize" the deposit, meaning there would be no impact on inflation, Moffatt said.
"Although there are no direct economic consequences, I cannot see the Obama administration using such an option," Moffatt said. "Such a move would be highly controversial and would not be well understood by the general public."
'Highly controversial' move
In an email to the Washington Post, Philip Diehl, the former director of the U.S. Mint and Treasury chief of staff who helped write the platinum coin law, also said there would be no negative macroeconomic effects.
"The accounting treatment of the coin is identical to the treatment of all other coins. The mint strikes the coin, ships it to the Fed, books $1 trillion, and transfers $1 trillion to the Treasury’s general fund where it is available to finance government operations just like with proceeds of bond sales or additional tax revenues," he wrote.
"Once the debt limit is raised, the Fed could ship the coin back to the mint where the accounting treatment would be reversed and the coin melted. The coin would never be “issued” or circulated and bonds would not be needed to back the coin."
Leaving nothing to chance, Oregon Republican Greg Walden said Monday he's planning to introduce a law that would bar the Treasury from minting such coin.
"This scheme to mint trillion-dollar platinum coins is absurd and dangerous, and would be laughable if the proponents weren’t so serious about it as a solution," he said in a statement. "I'm introducing a bill to stop it in its tracks."