key: cord-0066406-ig0uemio
authors: Breuer, Christian
title: Structural Indicators and the Fiscal Uncertainty Principle
date: 2021-08-05
journal: Inter Econ
DOI: 10.1007/s10272-021-0977-6
sha: 6cd3cb537e17884e4bb535423c4523bea8cd23f7
doc_id: 66406
cord_uid: ig0uemio

nan

The uncertainty principle in quantum mechanics (also known as Heisenberg's uncertainty principle) states that you cannot predict, with perfect accuracy, both the position and momentum of a particle. In economics, we realise that we can predict the values of two macroeconomic indicators, the output gap and the fi scal stance, with only limited accuracy. We cannot estimate both indicators without taking into account the other parameter's estimate. While the United States has recently used a huge fi scal stimulus to considerably increase GDP as well as potential output, Europe after the fi nancial crisis learned how austerity not only reduced current GDP, but also potential GDP and so-called structural fi scal balances, contrary to the intention of the European fi scal rules.

One issue of simultaneous estimations of the output gap and of the "structural" fi scal indicator is endogeneity, in particular endogeneity of the output gap (or estimated potential output). While a fi scal stimulus (as currently in the US) increases GDP (and thus decreases the negative output gap), the more recent literature on the revisions of output gap estimates highlights that estimates of potential output have been reversed procyclically (Heimberger and Kapeller, 2017) . Heimberger (2020) shows that one additional percentage point in predicted loss of actual output is associated with a loss in potential output of about 0.6 percentage points. Consequently, estimates of the potential output and the output gap are not independent of changes in fi scal policy.

The relationship between fi scal policy and current GDP is an established result of the modern empirical literature. Earlier studies, which estimated no or even negative fi scal multipliers and have been discussed during the euro crisis, turned out to be fl awed (Guajardo et al., 2014; Breuer, 2019) . Furthermore, Fatás and Summers (2018) and Gechert et al. (2019) discuss the direct relationship between fi scal policy and long-run GDP.

An increase in the fi scal defi cit would increase GDP as well as potential GDP and also lead to an endogenous positive response of the primary government budget balance, depending on the effect of automatic stabilisers. The different effects will be stronger if the fi scal multiplier appears to be larger or if automatic stabilisers turn out to be higher. And the effect will be negative for negative shocks, as for example during the euro crisis or the recent COVID-19 crisis.

If the crisis worsens the economic outlook, potential output declines and structural defi cits increase, thus demanding more fi scal tightening. The idea of adjusting the defi cit for endogenous automatic effects of the business cycle on the government budget is the big improvement of the second generation fi scal rules, compared to the static 3% Maastricht rule. But the endogeneity of output gap estimates and thus uncertain estimates of structural balances challenge the reliability and soundness of the European fi scal framework. Currently, the rules are suspended. Researchers argue that the rules need to be revised before they are reintroduced (Breuer, 2021; Kammer and Arnold, 2021; von Weizsäcker and Krämer, 2021) .

In the recent discussion of how to reform the fi scal compact and to estimate the output gap, Krahé and Sigl-Glöckner (2021) argue that potential output should be based on full employment rather than technical estimates of "structural" unemployment. In this line, Posen (2021) suggests using labour market-based cyclical indicators rather than the unobservable output gap. Already Blanchard (1990) has been sceptical about output gap estimates and suggested using unemployment Editorial Christian Breuer, ZBW -Leibniz Information Centre for Economics, Hamburg, Germany. as a "natural" cyclical indicator. Following this line, Fontanari et al. (2020) provide a method for how to estimate output gaps that are less prone to revisions based on the relationship between unemployment and GDP (Okun's law).

Another idea to provide "natural" structural economic indicators would be to analyse what an indicator would look like if it maintains the status quo rather than actively shifting other indicators considerably -e.g. the long-run debt ratio -towards an arbitrary value. A "structural" defi cit -e.g. of 0.5% of GDP -cannot be structural if it has considerable implications for other indicators.

Stabilising initial conditions of debt-GDP-ratios at current average levels, e.g. 100% of GDP, would allow defi cits approximately as high as the nominal growth rate of GDP, well above the current limit of 0.5% of GDP of the European fi scal framework. In other words: The European fi scal framework sets defi cit limits that distort debt-GDP-ratios, GDP and potential GDP away from initial conditions. Stabilising the current targets would allow a fi scal stimulus that would increase GDP as well as potential output, including an endogenous response of the fi scal balance. Assuming a lower fi scal defi cit would imply that GDP, potential GDP and the output gap would be lower than expected.

A more natural structural indicator could also take into account a constant ratio of public capital to GDP, and thus require a certain amount of (net) government investment. In most European countries, this would require a higher ratio of public investment to GDP.

Further, euro area countries cannot use exchange rates to improve competitiveness and to stabilise the current account. For the current account to be balanced in the long run, a policy is required that will increase fi scal defi cits or prices in surplus countries and reduce fi scal defi cits in the countries running a trade defi cit. Rather than pushing debt ratios to any new arbitrary level, structural indicators in a currency union should try to estimate how "structural" nominal GDP and price levels could bring real exchange rates and current account imbalances to balance. According to this view, surplus countries like Germany would need a real appreciation, taking into account the infl ation target of the central bank. This would help the ECB to shift monetary policy away from the liquidity trap and the low interest environment.

On the other hand, if we ignore the systematic macroeconomic interdependencies and just fearfully try to tighten the belt of one single indicator, without any theoretical reasoning, we should not be surprised if the whole system turns out to be in disequilibrium, even when our estimated structural indicator appears to be close to balance.

Suggestions for a new set of fi scal indicators

Expansionary Austerity and Reverse Causality: A Critique of the Conventional Approach

Staatsverschuldung nach Corona: Rückkehr zur Goldenen Regel

The permanent effects of fi scal consolidations

Potential Output in Theory and Practice: A Revision and Update of Okun's Original Method

Long-Term Effects of Fiscal Stimulus and Austerity in Europe

Expansionary Austerity? International Evidence

Potential Output, EU Fiscal Surveillance and the COVID-19 Shock

The performativity of potential output: pro-cyclicality and path dependency in coordinating European fi scal policies

Europe's COVID-19 Crisis Response: A Race Well Run, But Not Yet Won?

Die Defi nition einer zukunftsfähigen Finanzpolitik

Fiscal Success During COVID-19 Says Believe the Good News