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Illustration: Aïda Amer/Axios

The trillion-dollar gap between actual GDP and potential GDP is a gap made up of misery, unemployment, and unfulfilled promise. It's also a gap that can be eradicated — if central banks embrace unconventional monetary policy.

  • That's the message from Eric Lonergan and Megan Greene, two economists who reject the idea that central banks have hit a "lower bound" on interest rates. In fact, they reject the idea that "interest rates" are a singular thing at all, and they fullthroatedly reject the idea — most recently put forward by New York Fed president Bill Dudley — that the Fed is "out of firepower."

Why it matters: If Lonergan and Greene are right, then central banks have effectively unlimited ammunition in their fight to increase inflation and employment. They are limited only by political will.

How it works: Historically, central banks have borrowed and lent at pretty much the same interest rate. But that doesn't have to be the case.

  • In Europe, the central bank, the ECB, is now lending money to banks at a -1% interest rate. That's significantly lower than the rate it pays on those banks' reserves.
  • European banks can't just borrow the money and put it on deposit at the central bank. They only get the loans if they turn around and re-lend them into the real economy — and their regulator, the European Banking Authority, makes sure that they do exactly that.

In the U.S., the Fed could do something similar. It could reduce the discount rate — the rate at which banks borrow money from the central bank — to, say, -3%, while still keeping the Fed Funds rate in positive territory.

  • Savers would still be able to get positive returns on their deposits, but borrowers could effectively be paid to borrow money.
  • The deeply discounted loans to the banks would be contingent on the banks taking that money and re-lending it into targeted areas of the economy, rather than speculating with it or using it to fund things like mortgages.

Be smart: By targeting the loans, a dual interest rate policy could turbocharge government efforts to, say, build a carbon-neutral economy.

My thought bubble: Such a policy looks — and is — very close to fiscal policy, rather than monetary policy. It violates the principle that central banks are politically independent. But the Fed is already working hand-in-glove with Treasury. And given political constraints on extra spending from Congress, it makes sense to find that money at the Fed instead.

Go deeper: Lonergan and Greene explain their proposal in detail in a fantastic episode of the "Macro Musings" podcast.

Go deeper

Big bank bond trading soared in 2020

Data: Analysis of company filings; Chart: Axios Visuals

The pandemic helped to pull big banks’ bond trading revenue out of a multi-year slump.

Why it matters: Revenue within the so-called fixed income, currency and commodity (FICC) divisions has been slowing for years.

Republican Sen. Sasse slams Nebraska GOP for "weird worship" of Trump after state party rebuke

Sen. Ben Sasse, (R-Neb.) Photo: Andrew Harnik - Pool/Getty Images

The Nebraska Republican Party on Saturday formally "rebuked" Sen. Ben Sasse (R-Neb.) for his vote to impeach former President Trump earlier this year, though it stopped short of a formal censure, CNN reports.

Why it matters: Sasse is the latest among a slate of Republicans who have faced some sort of punishment from their state party apparatus after voting to impeach the former president. The senator responded statement Saturday, per the Omaha World-Herald, saying "most Nebraskans don't think politics should be about the weird worship of one dude."

Cuomo barraged by fellow Dems after second harassment accusation

New York Gov. Andrew Cuomo faced a barrage of criticism from fellow Democrats after The New York Times reported that the second former aide in four days had accused him of sexual harassment.

Why it matters: Cuomo had faced a revolt from legislators for his handling of nursing-home deaths from COVID. Now, the scandal is acutely personal, with obviously grave political risk.