Abstract
Does military spending exacerbate income inequality? After the Cold War, many developed countries sought to reduce military expenditures in the face of a new security environment without the clear and present threat of large-scale international conflict. The literature has presented mixed evidence on the economic effects of military spending. Moreover, during this era analysts in the OECD have become preoccupied with the economic indicator of income equality. Our study examines the relationship between military expenditures and income inequality. Complementing the established literature on the subject, we find that these two phenomena indeed possess a positive relationship and it is unlikely that this association is due to random chance. Our results are robust to the inclusion of control variables common in the literature. These findings lead us to contemplate the historical and theoretical account of the peace dividend narrative.
Funding source: Division of Graduate Education
Award Identifier / Grant number: DGE-1313583
Funding statement: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program, Division of Graduate Education, Funder Id: 10.13039/100000082, under Grant Number: DGE-1313583. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
Appendix
This section contains analyses that may be of interest to readers or reviewers that are not meant to be featured in the study itself. Because they are not simply meant to be inserted into the paper (where an explanation of the results is already present) we will briefly describe each figure or table and where or how it relates to our paper.
Alternative Tables for the Mann Whitney U Test
Inclusion of Portugal as a higher military spender
Portugal’s average military expenditures per GDP over the period of study are 2.07999%. Because it is so close to our average, Table 8 includes Portugal’s membership among these states. As you can see, including Portugal actually lowers the p-value.
Mann-Whitney U Test of Avg. Inequality grouped according to whether Avg. Military Expenditure is Higher than the OECD Avg.
| Country | Avg. EHII (1989–2007) | Avg. country mil. exp. > avg. OECD mil. exp. |
|---|---|---|
| Australia | 36.13 | No |
| Austria | 35.55 | No |
| Belgium | 38.15 | No |
| Canada | 38.02 | No |
| Chile | 47.8 | Yes |
| Czech Rep. | 28.76 | No |
| Denmark | 31.57 | No |
| Estonia | 34.89 | No |
| Finland | 33.22 | No |
| France | 36.74 | Yes |
| Germany | 34.73 | No |
| Greece | 43.29 | Yes |
| Hungary | 38.56 | No |
| Ireland | 36.18 | No |
| Israel | 43.13 | Yes |
| Italy | 36.83 | No |
| Japan | 40.05 | No |
| Luxembourg | 35.03 | No |
| Mexico | 45.39 | No |
| Netherlands | 35.94 | No |
| New Zeal. | 39.39 | No |
| Norway | 35.04 | Yes |
| Poland | 36.95 | No |
| Portugal | 38.62 | Yes |
| Slovakia | 36.16 | No |
| Slovenia | 31.74 | No |
| South Korea | 37.8 | Yes |
| Spain | 39.41 | No |
| Sweden | 29.59 | No |
| Switzerland | 31.97 | No |
| Turkey | 48.18 | Yes |
| UK | 36.06 | Yes |
| USA | 38.61 | Yes |
Mann-Whitney U Test Results: Z = −2.468, p = 0.0136.
Above NATO mandated average for Military average
European countries’ propensity to under-contribute to NATO military spending has remained a contentious issue for decades. Framing the presentation of the table in this way, in terms of countries at or exceeding the NATO target agreed to in 2006 and reaffirmed in 2014 of countries to target military spending at 2% of GDP. Although this move is mostly after the dataset, it may be a useful datapoint from a framing perspective (given that an “average of averages” measure may seem to some as convoluted).
Doing so adds Portugal and Australia to the list. As you can see in Table 9, there are no substantive changes from the Mann Whitney U test results presented in the paper.
Mann-Whitney U test of avg. inequality grouped according to whether avg. military expenditure is higher than NATO target.
| Country | Avg. EHII (1989–2007) | Avg. country mil. exp. > NATO target |
|---|---|---|
| Australia | 36.13 | Yes |
| Austria | 35.55 | No |
| Belgium | 38.15 | No |
| Canada | 38.02 | No |
| Chile | 47.8 | Yes |
| Czech Rep. | 28.76 | No |
| Denmark | 31.57 | No |
| Estonia | 34.89 | No |
| Finland | 33.22 | No |
| France | 36.74 | Yes |
| Germany | 34.73 | No |
| Greece | 43.29 | Yes |
| Hungary | 38.56 | No |
| Ireland | 36.18 | No |
| Israel | 43.13 | Yes |
| Italy | 36.83 | No |
| Japan | 40.05 | No |
| Luxembourg | 35.03 | No |
| Mexico | 45.39 | No |
| Netherlands | 35.94 | No |
| New Zeal. | 39.39 | No |
| Norway | 35.04 | Yes |
| Poland | 36.95 | No |
| Portugal | 38.62 | Yes |
| Slovakia | 36.16 | No |
| Slovenia | 31.74 | No |
| South Korea | 37.8 | Yes |
| Spain | 39.41 | No |
| Sweden | 29.59 | No |
| Switzerland | 31.97 | No |
| Turkey | 48.18 | Yes |
| UK | 36.06 | Yes |
| USA | 38.61 | Yes |
Mann-Whitney U Test Results: Z = −2.291, p = 0.0219.
Random Effects models w/AR(1) disturbances
Table 10 is essentially applying the model specification of Kentor et al. (2012), intended for scholars who are interested in a similar phenomenon. We opt to present the Driscoll-Kraay SEs due to the close proximity (and therefore virtual certainty of cross-sectional dependence) of our countries, making them a most sensible choice. The Kentor et al. (2012) study is more of a global sample and therefore it may not be as necessary to assume cross-sectional dependence. Nevertheless, we feel re-running our results using a similar model class serves as an appropriate robs.
RE GLS w/AR(1) disturbances
| Variables | (1) | (2) | (3) | (4) |
|---|---|---|---|---|
| EHII Gini | EHII Gini | EHII Gini | EHII Gini | |
| Military exp. % GDP | 0.545** | 0.541** | 0.589** | 0.409 |
| (0.236) | (0.235) | (0.239) | (0.221) | |
| Net. FDI out. % GDP | 0.00311 | 0.00311 | 0.00411 | 0.00246 |
| (0.00462) | (0.00463) | (0.00468) | (0.00465) | |
| Government consumption | 0.0977 | 0.0998 | 0.0935 | 0.111 |
| (0.0776) | (0.0777) | (0.0784) | (0.0774) | |
| Soc. welfare exp. % GDP | −0.108 | −0.109 | −0.0988 | −0.105 |
| (0.0555) | (0.0556) | (0.0565) | (0.0573) | |
| GDP growth | −0.0393** | −0.0391** | −0.0363** | −0.0395** |
| (0.0181) | (0.0182) | (0.0183) | (0.0183) | |
| Labor force part. | −0.189*** | −0.186*** | −0.188*** | −0.220*** |
| (0.0396) | (0.0404) | (0.0408) | (0.0386) | |
| Population (millions) | 0.00459 | 0.00424 | 0.00125 | −0.00364 |
| (0.00804) | (0.00792) | (0.00814) | (0.00714) | |
| GDP per capita (thousands) | 0.0128 | 0.0130 | 0.00574 | −0.00287 |
| (0.0164) | (0.0164) | (0.0169) | (0.0169) | |
| Trade union density | −0.0507*** | −0.0433** | −0.0459** | −0.0544*** |
| (0.0183) | (0.0210) | (0.0197) | (0.0187) | |
| Taxation % GDP | −0.0552 | −0.0537 | −0.0491 | −0.0599** |
| (0.0304) | (0.0305) | (0.0308) | (0.0304) | |
| Debt % GDP | 0.0104 | 0.0104 | 0.00802 | 0.00825 |
| (0.00736) | (0.00737) | (0.00747) | (0.00743) | |
| Imports % GDP | −7.282e + 07 | −9.053e + 07 | −6.547e + 08 | −1.260e + 06 |
| (1.476e + 08) | (1.485e + 08) | (3.645e + 08) | (1.447e + 08) | |
| Corporatist | 0.113 | |||
| (1.171) | ||||
| Liberal | 2.528 | |||
| (1.309) | ||||
| Post-communist | −2.960** | |||
| (1.327) | ||||
| Productivist | −0.126 | |||
| (1.917) | ||||
| SDEM | −1.362 | |||
| (1.462) | ||||
| CDEM | −0.556 | |||
| (0.733) | ||||
| Social democratic | −1.127 | |||
| (1.580) | ||||
| Constant | 52.69*** | 52.34*** | 53.66*** | 55.84*** |
| (2.899) | (2.998) | (3.037) | (3.291) | |
| Observations | 402 | 402 | 394 | 402 |
| Number of countries | 33 | 33 | 32 | 33 |
| N | 402 | 402 | 394 | 402 |
| Overall R-squared | 0.552 | 0.535 | 0.559 | 0.663 |
Standard errors in parentheses. Time dummies not reported.
*** p < 0.01, ** p < 0.05, * p < 0.01.
Prais-Winsten w/correlated PCSEs and panel-specific AR(1)
As an alternative to RE, in Table 11 we use Prais-Winsten regression with panel corrected standard errors (PCSE). If no autocorrelation were specified, this would be an OLS model. We use pairwise selection due to the unbalanced nature of the panel. Although we don’t report the results in this appendix (but do include the code in our replication file), whether we choose to allow the AR(1) coefficients of correlation to vary across panels or not, it does not make a substantive difference. One point we would like to note, regarding possible issue, is the high R2. We witnessed similar R2 even when the AR(1) does not vary. This may deserve further investigation, and at this point we will simply take note of it.
Prais-Winsten regression.
| Variables | (1) | (2) | (3) | (4) |
|---|---|---|---|---|
| EHII Gini | EHII Gini | EHII Gini | EHII Gini | |
| Military exp. % GDP | 0.541*** | 0.517*** | 0.602*** | 0.285** |
| (0.133) | (0.142) | (0.128) | (0.133) | |
| Net. FDI out. % GDP | 0.00804 | 0.00815 | 0.00900** | 0.00734 |
| (0.00454) | (0.00472) | (0.00441) | (0.00487) | |
| Government consumption | −0.00334 | −0.0115 | −0.0157 | 0.0203 |
| (0.0686) | (0.0682) | (0.0672) | (0.0731) | |
| Soc. welfare exp. % GDP | −0.225*** | −0.233*** | −0.206*** | −0.182*** |
| (0.0386) | (0.0377) | (0.0374) | (0.0548) | |
| GDP growth | −0.0628** | −0.0670** | −0.0580 | −0.0545** |
| (0.0318) | (0.0332) | (0.0310) | (0.0274) | |
| Labor force part. | −0.260*** | −0.275*** | −0.256*** | −0.308*** |
| (0.0341) | (0.0344) | (0.0376) | (0.0335) | |
| Population (millions) | −0.00208 | −0.00298 | −0.00352 | −0.00832*** |
| (0.00253) | (0.00241) | (0.00275) | (0.00270) | |
| GDP per capita (thousands) | 0.0328*** | 0.0342*** | 0.0347*** | 0.0244 |
| (0.0127) | (0.0127) | (0.0129) | (0.0135) | |
| Trade union density | −0.0639*** | −0.0912*** | −0.0668*** | −0.0989*** |
| (0.0127) | (0.0155) | (0.0133) | (0.0185) | |
| Taxation % GDP | 0.0172 | 0.0167 | 0.0222 | −0.0453 |
| (0.0367) | (0.0355) | (0.0380) | (0.0339) | |
| Debt % GDP | 0.0265*** | 0.0303*** | 0.0245*** | 0.0322*** |
| (0.00708) | (0.00668) | (0.00705) | (0.00554) | |
| Imports % GDP | −3.347e + 08*** | −3.036e + 08*** | −5.730e + 08*** | −7.252e + 07 |
| (1.127e + 08) | (1.154e + 08) | (1.971e + 08) | (9.827e + 07) | |
| Corporatist | −2.684** | |||
| (1.151) | ||||
| Liberal | −0.284 | |||
| (0.913) | ||||
| Post-communist | −4.351*** | |||
| (1.152) | ||||
| Productivist | −4.416*** | |||
| (1.310) | ||||
| CDEM | −1.608 | |||
| (1.263) | ||||
| SDEM | −1.726 | |||
| (1.291) | ||||
| Social democratic | 2.136*** | |||
| (0.705) | ||||
| Constant | 59.07*** | 60.89*** | 60.32*** | 66.15*** |
| (2.294) | (2.469) | (2.666) | (3.072) | |
| Observations | 402 | 402 | 394 | 402 |
| R-squared | 0.960 | 0.959 | 0.961 | 0.966 |
| Number of countries | 33 | 33 | 32 | 33 |
| Chi-squared statistic | 646.3 | 751.0 | 656.7 | 1114 |
| Chi-squared p-value | 0 | 0 | 0 | 0 |
Panel-Corrected Standard errors in parentheses.
*** p < 0.01, ** p < 0.05, * p < 0.01.
Robust Twostep Estimator “collapse” re-specification w/xtabond2
In Table 12 we present results using our base model of the DPD estimator with the user-created STATA package xtabond, using Windmeijer (2005) corrected standard errors. Despite the fact that using the collapse featuring drastically reduces the number of instruments (38) so that we have likely avoided overfitting, in our opinion, there are a couple reasons to nevertheless remain cautious this estimator. First, the estimator does not calculate the AR(1) statistic. This may not be important since it is not AR(1) violations that cause the mis-specification and the AR(2) statistic is calculated and we do not reject the null hypothesis, which is good for the model. Second, while passing the Sargan test is a good sign, the Hansen test statistic (0.042) yields a p-value of 1.00, which likely indicates inability of detection (though does not necessarily constitute a failure of the test). As we mention in the paper and others have mentioned elsewhere, these models are notoriously sensitive to specification. As with all the inferential models in the paper, we are conservative regarding their individual explanatory power.
System DPD estimation w/collapse feature and twostep.
| Variables | (1) |
|---|---|
| EHII Gini | |
| EHII Gini (lagged) | 0.753** |
| (0.306) | |
| Military exp. % GDP | 3.180*** |
| (0.920) | |
| Net. FDI out. % GDP | 0.0260*** |
| (0.00803) | |
| Government consumption | −2.052** |
| (0.994) | |
| Soc. welfare exp. % GDP | 0.0632 |
| (0.528) | |
| Debt % GDP | 0.0789* |
| (0.0447) | |
| MIDS onset | 1.033** |
| (0.429) | |
| GDP growth | −0.438*** |
| (0.0986) | |
| Labor force part. | 0.187* |
| (0.101) | |
| Population (millions) | −0.0646*** |
| (0.0202) | |
| GDP per capita (thousands) | 0.0512 |
| (0.0606) | |
| Trade union density | 0.0771 |
| (0.0542) | |
| Taxation % GDP | 0.00210 |
| (0.0280) | |
| Imports % GDP | 1.868e + 08 |
| (1.843e + 08) | |
| Constant | 26.69*** |
| (9.161) | |
| Observations | 385 |
| Number of countries | 33 |
| Chi-squared statistic | 104.7 |
| Chi-squared p-value | 2.16e−09 |
| AR(1) statistic | . |
| AR(1) p-value | . |
| AR(2) statistic | −0.938 |
| AR(2) p-value | 0.348 |
| Sargan test statistic | 3.895 |
| Hansen test statistic | 0.0402 |
Figure 3 shows the predicted value of Y from the base models – i.e. without political and welfare regime covariates – as they vary with the military spending % GDP variable.

The predicted value of Y from the base models – i.e. without political and welfare regime covariates – as they vary with the military spending % GDP variable.
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©2019 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Editorial
- 2nd Walter Isard Annual Award for the Best Article in Peace Economics Peace Science and Public Policy
- Research Articles
- Armed Conflict and Schooling in Rwanda: Digging Deeper
- Sounding the Alarm: The Political Economy of Whistleblowing in the US Security State
- Military Expenditures and Income Inequality among a Panel of OECD Countries in the Post-Cold War Era, 1990–2007
- Polity Stability, Economic Growth, and Investment: A Dynamic Panel Analysis
- Government Debt and Economic Growth. A Threshold Analysis for Greece
Articles in the same Issue
- Editorial
- 2nd Walter Isard Annual Award for the Best Article in Peace Economics Peace Science and Public Policy
- Research Articles
- Armed Conflict and Schooling in Rwanda: Digging Deeper
- Sounding the Alarm: The Political Economy of Whistleblowing in the US Security State
- Military Expenditures and Income Inequality among a Panel of OECD Countries in the Post-Cold War Era, 1990–2007
- Polity Stability, Economic Growth, and Investment: A Dynamic Panel Analysis
- Government Debt and Economic Growth. A Threshold Analysis for Greece