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(From Talking Points Memo).

Well, the trillion-dollar-coin thing — deal with the debt ceiling by exploiting a legal loophole to have the Treasury mint one or more large-denomination coins, deposit them at the Fed, and use the cash in the new account to pay bills — has really taken off. Last month I spoke with a senior Fed official who had never heard of the idea; these days it’s all over.

There seem to be two kinds of objections. One is that it would be undignified. Here’s how to think about that: we have a situation in which a terrorist may be about to walk into a crowded room and threaten to blow up a bomb he’s holding. It turns out, however, that the Secret Service has figured out a way to disarm this maniac — a way that for some reason will require that the Secretary of the Treasury briefly wear a clown suit. (My fictional plotting skills have let me down, but there has to be some way to work this in). And the response of the nervous Nellies is, “My god, we can’t dress the secretary up as a clown!” Even when it will make him a hero who saves the day?

The other objection is the apparently primordial fear that mocking the monetary gods will bring terrible retribution.

Joe Weisenthal says that the coin debate is the most important fiscal policy debate of our lifetimes; I agree, with two slight quibbles — it’s arguably more of a monetary than a fiscal debate, and it’s really part of the broader debate that has been going on ever since we entered the liquidity trap.

What the hysterics see is a terrible, outrageous attempt to pay the government’s bills out of thin air. This is utterly wrong, and in fact is wrong on two levels.

The first level is that in practice minting the coin would be nothing but an accounting fiction, enabling the government to continue doing exactly what it would have done if the debt limit were raised.

Remember that the coin is supposed to be deposited at the Fed, which is effectively just a semi-autonomous government agency. As the federal government proper drew on its new Fed account, the Fed would probably respond by selling off some of its $3 trillion balance sheet. In effect, the consolidated federal government, including the Fed, would be financing its operations by selling debt instruments, just as always.

But what if the Fed decided not to shrink its outside balance sheet? Even so, under current conditions it would make no difference — because we’re in a liquidity trap, with market interest rates on short-term federal debt near zero. Under these conditions, issuing short-term debt and just “printing money” (actually, crediting banks with additional reserves that they can convert into paper cash if they choose) are completely equivalent in their effect, so even huge increases in the monetary base (reserves plus cash) aren’t inflationary at all.

And if you’re tempted to deny this diagnosis, I have to ask, what would it take to convince you? The other side of this debate has been predicting runaway inflation for more than four years, as the monetary base has tripled. The same people predicted soaring interest rates from government borrowing. Meanwhile, the liquidity-trap people like me predicted what would actually happen: low inflation and low rates. This has to be the most decisive real-world test of opposing theories ever.

So minting the coin would be undignified, but so what? At the same time, it would be economically harmless — and would both avoid catastrophic economic developments and help head off government by blackmail.

What we all hope, of course, is that the prospect of the coin or some equivalent strategy will simply take the debt ceiling off the table. But if not, mint the darn coin.