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A Game-Theoretic View of the Fiscal Theory of the Price Level

Econometrica 2002 70(6), 2167-2195
The goal of this paper is to probe the validity of the fiscal theory of the price level by modeling explicitly the market structure in which households and the governments make their decisions. I describe the economy as a game, and I am thus able to state precisely the consequences of actions that are out of the equilibrium path. I show that there exist government strategies that lead to a version of the fiscal theory, in which the price level is determined by fiscal variables alone. However, these strategies are more complex than the simple budgetary rules usually associated with the fiscal theory, and the government budget constraint cannot be merely viewed as an equilibrium condition.

A Game-Theoretic View of the Fiscal Theory of the Price Level

Econometrica 2002 70(6), 2167-2195 open access
The goal of this paper is to probe the validity of the fiscal theory of the price level by modelling explicitly the market structure in which households and the government make their decisions. I describe the economy as a game, and I am thus able to state precisely the consequences of actions that are out of the equilibrium path. I show that there exist government strategies that lead to a version of the fiscal theory, in which the price level is determined by fiscal variables alone. These strategies are however more complex than the simple budgetary rules usually associated with the fiscal theory, and the government budget constraint cannot be merely viewed as an equilibrium condition. Copyright The Econometric Society 2002.

Negative Nominal Interest Rates

American Economic Review 2004 94(2), 104-108
The determination of inflation is one of many examples in which economic outcomes are driven by an intricate interaction between private expectations and government policy. In these instances, achieving a good equilibrium outcome (e.g., low and stable inflation) requires the policymaker to adopt rules that are not only compatible with the desired outcome, but that also avoid the existence of different equilibria: it is a problem of strict implementation. Recently, some solutions to the implementation problem have generated a heated debate, spurred by a surprising disagreement on setting apart equilibrium conditions from restrictions on government policy that must hold under all contingencies. An example of this is the controversy over the fiscal theory of the price level. 1 In this paper, we consider an even more paradoxical case, namely, the zero bound on nominal interest rates. While most people view the bound to be a constraint on monetary policy, which cannot be violated under any contingency, the traditional macroeconomic models, based on a notion of competitive equilibrium adapted for the presence of a big player, make it equally possible to interpret the zero bound as an equilibrium condition. 2 Indeed, negative nominal

Tax Riots

Review of Economic Studies 2008 75(3), 649-669
This paper considers an optimal taxation environment where household income is private information, and the government randomly audits and punishes households found to be underreporting. We prove that the optimal mechanism derived using standard mechanism design techniques has a bad equilibrium (a tax riot) where households underreport their incomes, precisely because other households are expected to do so as well. We then consider three alternative approaches to designing a tax scheme when one is worried about bad equilibria.

A Monetary-Fiscal Theory of Sudden Inflations

Quarterly Journal of Economics 2025 140(3), 1959-2000
This article posits an information channel as an explanation for sudden inflations. Households saving via nominal government bonds face a choice whether to acquire costly information about future government surpluses. They trade off the cost of acquiring information about the surpluses that back bond repayment against the benefit of a more informed saving decision. Through the information channel, small changes in the economic environment can trigger large responses in consumer behavior and prices. This setting explains why there can be long stretches of time during which government surpluses have large movements with little inflation response; then at some point, something snaps, and a sudden inflation takes off that is strongly responsive to incoming fiscal news.

Politics and Efficiency of Separating Capital and Ordinary Government Budgets*

Quarterly Journal of Economics 2006 121(4), 1167-1210
We analyze the democratic politics of a rule that separates capital and ordinary account budgets and allows the government to issue debt only to finance capital items. Many national governments followed this rule in the 18th and 19th centuries and most US states do so today. Despite its simplicity, this 1800s financing rule provides excellent incentives for majorities to choose an efficient mix of public goods in an economy with a growing population of overlapping generations of long-lived but mortal agents. In a special limiting case of our model where the demographics make Ricardian equivalence prevail, the 1800s rule does nothing to promote efficiency. But when the demographics imply even a moderate departure from Ricardian equivalence, imposing the rule substantially improves the efficiency of democratically chosen allocations. We calibrate some examples to U.S. demographic data and use our findings to offer a tentative explanation for why the 1800s rule was abandoned by the Federal government but not by state governments in the twentieth century

Is Inflation Default? The Role of Information in Debt Crises

American Economic Review 2019 109(10), 3556-3584 open access
We study the information sensitivity of government debt denominated in domestic versus foreign currency: the former is subject to inflation risk and the latter to default. Default only affects sophisticated bond traders, whereas inflation concerns a larger and less informed group. Within a two- period Bayesian trading game, differential information manifests itself in the secondary market, and we display conditions under which debt prices are more resilient to bad news even in the primary market, where only sophisticated players operate. Our results can explain debt prices across countries following the 2008 financial crisis, and also provide a theory of “original sin.”

A Ramsey Theory of Financial Distortions

Journal of Political Economy 2024 132(8), 2612-2654
The return on government debt is lower than that of assets with similar payoffs. We study optimal debt management and taxation when the government cannot directly redistribute toward the agents in need of liquidity but otherwise has access to a complete set of linear tax instruments. Optimal government debt provision calls for gradually closing the wedge between the returns as much as possible, but tax policy may work as a countervailing force: as long as financial frictions bind, it can be optimal to tax capital even if this magnifies the discrepancy in returns.

Institution Building without Commitment

American Economic Review 2024 114(11), 3427-3468 open access
We propose a theory of gradualism in the implementation of good policies, suitable for environments featuring time consistency. We downplay the role of the initial period by allowing agents both to wait for future agents to start equilibrium play and to restart the equilibrium by ignoring past history. The allocation gradually transits toward one that weighs both short- and long-term concerns, stopping short of the Ramsey outcome but greatly improving upon Markovian equilibria. We use the theory to account for the slow emergence of both climate policies and the reduction of global tariff rates.