This study investigates the effect of government size, as measured by the tax revenue to gross domestic product (tax-GDP) ratio, on output responses to increases in government purchases. First, we show that in a standard static neoclassical model, the stimulus effect of fiscal expansion on output increases with the tax-GDP ratio. This finding is quantitatively confirmed using a dynamic neoclassical model with standard functional forms and parameter values. To empirically test the theoretical findings, we analyze the responses of macroeconomic variables to an unanticipated increase in government purchases for 12 Organisation for Economic Cooperation and Development (OECD) countries during 1985–2019 using a state-dependent local projection method. The estimation results reveal that while output responses to an unanticipated fiscal expansion are significantly positive when the tax-GDP ratio is high, they are statistically indistinguishable from zero when the ratio is low. Overall, our findings suggest that fiscal expansion can stimulate output more effectively at high tax rates, unlike the well-known predictions of the traditional Keynesian model.

Does household debt affect the size of the fiscal multiplier? We investigate the effects of household debt on government spending multipliers using a smooth transition vector autoregression model. Through generalized impulse response functions, we measure whether the effect of government spending on GDP is conditioned by different levels of household debt in Australia, Sweden, and Norway, three countries with high levels of household indebtedness, and in the world’s seven largest economies. Our results indicate that the short-term effects of government spending tend to be higher if fiscal expansion takes place during periods of low household debt. On average, the fiscal multiplier (on impact) is 0.70, 0.61, and 0.79 (percent of GDP) larger when the increase in government spending takes place during periods of low household debt for Australia, Norway, and the United States.

This paper aims to estimate the government investment fiscal multipliers in select European countries for the period 1970–2016. To do this, we combine Structural Vector Autoregression (SVAR) modeling with the Local Projections (LP) approach. We estimate models by also controlling for fiscal foresight, excluding the postcrisis period and distinguishing between Northern and Southern countries. Our findings suggest that an increase in government investment generates a “Keynesian effect” by engendering positive and permanent effects on the GDP level, even when government expenditure expectations are considered. Fiscal multipliers are close to 1 on impact and increase in the years after the implementation of a discretionary fiscal policy.

This paper examines how population aging affects the output effect of a government spending shock by using a panel data of OECD countries. The government spending shock is identified as a forecast error of government spending, and its output effect is estimated by using the local projection method. We find that population aging affects the output effect of the government spending shock. While in non-aging economies, government spending shock increases output significantly in both short- and medium-terms, in aging economies, output responses are not statistically significant.

This paper analyzes a regime-switching New Keynesian model to understand what happens to the aggregate economy when the nominal interest rate hits the zero lower bound (ZLB). Contrary to the literature, our model predicts that the aggregate demand curve is not always upward sloping when the ZLB binds. Instead, it depends on expectations. If the expected duration of the ZLB is short but consistent with expectations surveys, the AD curve can be downward sloping. In that case, the fiscal multiplier is moderate and supply-side reforms are expansionary. These results complement existing findings in the literature.

We estimate the effects of government spending shocks during prolonged episodes of low interest rates, which we consider as proxy for the effective lower bound (ELB). Using a panel VAR model for 17 advanced countries, we find that both the government consumption and investment multipliers are significantly higher, and exceed unity, when interest rates are persistently low. Distinguishing between construction- and equipment-related government investments, we find that only the former raises output by significantly more when the ELB binds. This result can be explained by existing New Keynesian models featuring time-to-build constraints on government investment.

Table 4 of this article was incorrectly published with subheadings in Table 4 missing. The publisher regrets this error and the correct version of Table 4 is presented here. Table 4.

Present-value multipliers for different specifications of fiscal policy in the new Keynesian model with rational expectations and with adaptive learning

	Rational expectations				Adaptive learning
	Impact	1 year	4 years	6 years	Impact	1 year	4 years	6 years
Strategy 1: Lump-sum financing (baseline model)
$\frac{{PV\left( {\Delta Y} \right)}}{{PV\left( {\Delta G} \right)}}\$	0.51	0.50	0.46	0.43	1.01	1.00	0.99	0.97
$\frac{{PV\left( {\Delta C} \right)}}{{PV\left( {\Delta G} \right)}}\$	−0.29	−0.30	−0.34	−0.37	0.09	0.09	0.07	0.06
$\frac{{PV\left( {\Delta I} \right)}}{{PV\left( {\Delta G} \right)}}\$	−0.20	−0.20	−0.20	−0.20	−0.08	−0.08	−0.09	−0.09
Strategy 2: Capital tax financing
$\frac{{PV\left( {\Delta Y} \right)}}{{PV\left( {\Delta G} \right)}}\$	0.32	0.29	0.12	0.02	0.43	0.38	0.20	0.08
$\frac{{PV\left( {\Delta C} \right)}}{{PV\left( {\Delta G} \right)}}\$	−0.23	−0.26	−0.40	−0.48	−0.08	−0.12	−0.27	−0.37
$\frac{{PV\left( {\Delta I} \right)}}{{PV\left( {\Delta G} \right)}}\$	−0.68	−0.69	−0.70	−0.71	−0.80	−0.80	−0.81	−0.82
Strategy 3: Labor tax financing
$\frac{{PV\left( {\Delta Y} \right)}}{{PV\left( {\Delta G} \right)}}\$	−0.64	−0.68	−0.85	−0.95	0.48	0.47	0.43	0.40
$\frac{{PV\left( {\Delta C} \right)}}{{PV\left( {\Delta G} \right)}}\$	−1.07	−1.10	−1.24	−1.33	−0.37	−0.38	−0.41	−0.43
$\frac{{PV\left( {\Delta I} \right)}}{{PV\left( {\Delta G} \right)}}\$	−0.71	−0.71	−0.73	−0.74	−0.17	−0.18	−0.18	−0.18

This paper examines the government spending multiplier when economic agents combine adaptive learning and knowledge about future fiscal policy to form their expectations. The analysis shows that the effects of a government spending shock substantially change when the rational expectations hypothesis is replaced by this learning mechanism. In contrast to the dynamics under rational expectations, a government spending shock in a small-scale new Keynesian DSGE model with learning crowds in private consumption and is associated with a positive comovement between real wages and hours worked. In the baseline calibration, the output multiplier under learning is above one and about twice as large as under rational expectations.

Some recent empirical evidence questions the typically large size of government spending multipliers when the nominal interest rate is stuck at zero, finding output multipliers of around 1 or even lower, with an upper bound of around 1.5 in some circumstances. In this paper, we use a recent estimate of the degree of substitutability between private and government consumption in an otherwise standard New Keynesian model to show that this channel significantly reduces the size of government spending multipliers obtained when the nominal interest rate is at zero. All else being equal, the relationship of substitutability makes a government spending shock crowd out private consumption while being less inflationary, thus, limiting the typically expansionary effect of the fall in the real interest rate. Subject to the nominal interest rate being constrained at zero, the model generates output multipliers ranging from 0.8 to 1.6.

This paper analyzes government spending multipliers in a two-country model of a monetary union with price stickiness and home bias in consumption where monetary policy is constrained by the zero lower bound (ZLB) on the nominal interest rate. Government spending multipliers under this constraint are computed and compared with fiscal multipliers in normal times, that is, where the central bank sets the nominal interest rate via a Taylor rule. The trade elasticity and the parameter measuring home bias in consumption play an important role in determining the size of the multiplier. The multipliers are not necessarily large under the ZLB constraint. However, compared with the fiscal multipliers when the central bank sets the nominal interest rate according to a Taylor rule, the multipliers under the ZLB are bigger. Moreover, the persistence parameter of the binding ZLB plays a crucial role.