Seigniorage
What is Seigniorage?
Seigniorage is the revenue a government earns from issuing money, the gap between what the money is worth and what it costs to create.
Issuing a note that costs a few cents to print and circulates at face value hands the issuer the difference, and that difference is real revenue. For a modern central bank the larger source is interest income, since it issues currency and reserves, buys interest-bearing assets with the proceeds, and remits its profit to the treasury. Seigniorage and the inflation tax are linked but not the same thing. Seigniorage is the resources a government obtains by putting new money into circulation, while the inflation tax is the loss suffered by people already holding money as rising prices erode what it buys. The two line up closely when a government issues money fast enough to drive inflation, and come apart when a growing economy absorbs new money without prices rising.
Seigniorage: a worked example
A note costs 8 cents to print and circulates at a face value of $20, so issuing one gains the government 20 minus 0.08 = $19.92 in real resources, and printing 10 million of them yields 10,000,000 × 19.92 = $199.2 million. The interest channel is usually bigger. A central bank holding $50 billion of bonds that yield 4 percent, funded by currency it issues at no interest, earns 50,000,000,000 × 0.04 = $2 billion a year and hands most of it to the treasury. Neither amount required a tax bill or a bond auction.
The mistake students make with seigniorage
Students use seigniorage and inflation tax interchangeably, or picture seigniorage as a money machine with no limit. It is genuine revenue, but it runs into a wall. Issuing faster raises inflation, and inflation makes people cut the real money balances the revenue is collected on, so past some point printing more money raises less real revenue. Hyperinflations are what hitting that wall looks like.
Seigniorage questions
Is seigniorage the same as the inflation tax?
No, seigniorage is the revenue a government earns by issuing money, while the inflation tax is the real loss borne by people holding money when prices rise. They overlap when new issuance is what drives the inflation, but a government can collect modest seigniorage in a growing economy without imposing a meaningful inflation tax.
How do modern central banks earn seigniorage?
Modern central banks earn seigniorage mainly as net interest, holding government securities against liabilities that pay little or nothing and passing the spread to the treasury. Profit on the physical printing of notes is a small part of the total in an economy where most money is electronic.
Can a government fund itself with seigniorage alone?
Not for long, because heavy reliance on new money causes inflation, and inflation shrinks the real money balances the revenue is drawn from. As people spend cash faster or switch to a foreign currency, the government has to issue at an accelerating pace to raise the same real amount, which is the mechanism behind hyperinflation.
Formula / Example
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