Fiscal theory of the price level

Based on Wikipedia: Fiscal theory of the price level

{"https://en.wikipedia.org/wiki/Fiscal_theory_of_the_price_level": "In 1981, two economists at the University of Minnesota named Thomas Sargent and Neil Wallace produced a paper that would quietly reshape how we think about inflation. Their argument was simple but unsettling: when governments run unsustainable deficits, they eventually have to print money to cover their debts—And no amount of raising interest rates can stop it.\n\nThis insight sits at the heart of what has become known as the Fiscal Theory of the Price Level, or FTPL. It's a theory that has spent decades in the shadows of mainstream economics, only to find renewed relevance in an era of massive government spending and persistent inflation.\n\n## The Core Idea: Fiscal Policy Over Monetary Policy\n\nAt its essence, the fiscal theory of the price level argues something counter-intuitive: the primary driver of prices isn't the amount of money in circulation, as the quantity theory suggests. Instead, it's the government's fiscal stance—whether it can balance its books over time, whether it will be able to pay off its debts through future tax revenue, and what expectations people have about the government's willingness to honor its obligations.\n\nThink of it this way: currency is like a stock in a government. If that government runs a persistent structural deficit—if it spends more than it collects in taxes over the economic cycle—then the "stock" loses value. And when the currency loses value, inflation follows.\n\nThis puts fiscal policy front and center. Unlike the quantity theory, which sees inflation as fundamentally a monetary phenomenon (if you want less inflation, simply tighten the money supply), FTPL suggests that even if central banks raise interest rates or reduce the money supply, they cannot fully control inflation unless there's credible fiscal discipline.\n\n## The Puzzle That Started It All\n\nThe theory emerged from a specific puzzle. In the early 1980s, both the United States and the United Kingdom were experiencing double-digit inflation despite extremely high interest rates. Central banks were raising rates aggressively—Paul Volcker had pushed the Federal Reserve's benchmark rate above 20 percent in 1981-yet prices kept climbing.\n\nStandard monetary theory suggested this shouldn't be possible. If you raise interest rates high enough, you should be able to brake any inflation. The fact that it wasn't working demanded explanation.\n\nJohn Cochrane, then at the University of California Berkeley, offered one. His key insight was that interest rate increases themselves became part of the inflation problem. When government debt becomes larger, the interest payments on that debt—the cost of servicing the debt-become genuinely inflationary. The payments flow to bond holders, who then spend the money, feeding price increases even as rates climb.\n\n## Confidence and the Collapse of Credibility\n\nWhat determines when inflation gets out of hand? Cochrane's answer revolves around confidence—or rather, the loss of confidence.\n\nWhen people begin to doubt that a nation's debt will be repaid responsibly, they start expecting inflation. They prepare for it by buying real assets, goods, and property. Those very purchases drive prices higher. The expectations become self-fulfilling.\n\nConversely, when fiscal policy appears sustainable—when the government shows it can balance its books over the cycle—the confidence holds. Prices stay stable even during periods of large deficits. The deficit itself might be preventing deflation rather than causing inflation.\n\nThis is where the theory gets nuanced. FTPL doesn't argue that all deficits cause inflation. Instead, it argues that when large deficits do not produce inflation, it's because those deficits were actually preventing deflation—keeping the economy from contracting further.\n\n## How Governments Actually Pay Their Debts\n\nA crucial distinction runs through this theory: there are two ways governments can pay off debts denominated in their own currency.\n\nIn nominal terms, they can refinance—roll over debt by issuing new bonds to pay old ones. Or they can amortize—pay down the debt using actual surpluses from tax revenue.\n\nIn real terms, there's a third option: inflate away the debt. If the government allows or causes high enough inflation, the real amount it must repay shrinks. The debt becomes manageable in nominal terms—but only through deliberate inflation.\n\nThis is why fiscal discipline matters so critically. A balanced budget over the economic cycle creates credibility. It reassures markets that the government won't need to inflate away its obligations—that it can pay them off through actual resources rather than monetary tricks.\n\n## The Debate Within Mainstream Economics\n\nThe fiscal theory of the price level has become one of the strongest voices in debates among mainstream economists about how to combat inflation.\n\nIts advocates argue that focusing on monetary policy alone—the Federal Reserve raising or lowering interest rates—is insufficient. Instead, fiscal policy must work alongside monetary policy. If the government runs structural deficits that cannot be closed through revenue, then even aggressive interest rate hikes won't stop inflation.\n\nThis position directly disputes Modern Monetary Theory, which holds that inflation can be controlled once it starts rising—through seizure of the fiscal surplus, if necessary. FTPL argues that's not enough. The government's own willingness to balance its books is essential.\n\nJohn Cochrane has been one of the theory's central proponents, publishing extensively from 1994 through 2001 on these questions. His work alongside Michael Dean Woodford helped establish what became a significant school of thought.\n\nOther economists have contributed substantially to the debate. Christopher A. Sims published key papers in 1994. Eric M. Leeper developed frameworks throughout the 1990s. Bennett T. McCallum produced influential work across 1999, 2001, and 2003. Narayana Kocherlakota and Christopher Phelan extended these ideas to new contexts.\n\nMore recently, de Rugy and others have brought fiscal theory into discussions about contemporary policy challenges.\n\n## What This Means for Policy\n\nThe implications are profound.\n\nIf the fiscal theory of the price level is correct, central banks cannot independently stop inflation when government spending remains structurally imbalanced. The extra spending on interest payments for government debt is itself inflationary—as much an outcome of fiscal policy as monetary policy.\n\nInterest rates should not be raised above the rate of inflation, Cochrane argues, because doing so worsens the debt burden and pushes inflation higher through the interest payment mechanism. Instead, governments must demonstrate credible fiscal discipline—must show they can balance their books over time—to maintain currency stability.\n\nThis puts real pressure on policymakers. Not just central banks must tighten policy. Governments themselves must demonstrate sustainable fiscal paths—not simply claim they'll balance budgets later, but actually achieve structural balance in practice.\n\n## The Relevance Today\n\nFTPL has found new relevance in recent years as governments worldwide confront massive spending programs and persistent inflation.\n\nThe theory suggests that if we want to control inflation, we cannot rely entirely on central banks. We must consider fiscal policy. And perhaps most critically, we need to believe in the government's commitment to not simply inflate away its debts—but actually pay them off through genuine economic surplus.\n\nWhen that faith falters, when confidence erodes, price levels follow. The lesson runs clear: currency is a promise, and promises require credible backing.\n\nThe 1981 paper by Sargent and Wallace has been vindicated more than anyone expected. Unsustainable deficits eventually force governments to print money, and even higher interest rates cannot fix the resulting inflation."}