VoxEU Column Productivity and Innovation

The intellectual spoils of war: How government spending on defence research benefits the private sector

Defence R&D is a major component of government-sponsored R&D in many developed economies, and the effect of defence R&D expenditures on private sector innovation and economic growth has been a hotly debated topic for many years. This column presents a systematic analysis across all OECD countries which suggests that a 10% increase in defence R&D results in a 4% increase in private R&D. It also reveals evidence of spillovers between countries, with increases in government-funded R&D in one country appearing to increase private R&D spending in the same industry in other countries.

Government funding for innovation related to military uses represents a key channel through which governments all over the world shape innovation. In the US, for example, annual government defence-related research and development (R&D) expenditures were $78 billion in 2016, accounting for over 57% of all government-funded R&D (Congressional Research Service 2018). While defence-related R&D is motivated by goals that are not mainly economic, it is often the most important de facto industrial policy used by central governments to affect the speed and direction of innovation in the economy. The amount of public money flowing into defence R&D dwarfs the amount spent on other prominent innovation policy tools in the US. For example, the total budget of the National Science Foundation or the overall value of the federal R&D tax credit in a typical year are less than one tenth of federal outlays for defence-related R&D (NSF 2006).  Defence R&D is the single most important component of government-funded R&D in the UK and France as well, and a major component of government-sponsored R&D in many other developed economies.

The effect of defence R&D expenditures on private sector innovation and economic growth has been a hotly debated topic for many years (see surveys by Mowery 2010 and Lichtenberg 1995, for example). Proponents of the benefits of defence R&D point to the commercial success of major innovations such as jet engines, computers, radar, nuclear power, semiconductors, GPS, and the internet as evidence that military R&D has been a crucial source of technological development with civilian applications (Lichtenberg 1984, 1988, Ruttan 2006, Mazzucato 2013). Some even argue that the Pentagon’s role as the world’s most generous investor in technological innovation during the Cold War – ultimately resulting in superior technologies for US companies and enduring gains in their competitiveness (Braddon, 1999) – was an important reason that US manufacturing became so dominant after WWII. More recently, defence R&D has been viewed as an important contributor to national economic growth through private sector spinoffs and agglomeration economies. Proponents of this view often point to Israel as an example of how defence spending has spawned a multitude of commercially successful high-tech startups (e.g. Senor and Singer 2009). 

On the other hand, critics argue that there are the benefits of defence R&D are meagre, primarily because military secrecy inhibits the scope of spillovers to civilian firms. Even more fundamentally, critics argue that defence-related R&D might displace private R&D and therefore could even have a negative impact on the total amount of innovation. Overall, there is much anecdotal evidence of some of the positive and negative effects that defence R&D might have on growth, but little systematic econometric evidence. 

In a recent paper (Moretti et al. 2019) we study the effect of government-funded R&D on private R&D – i.e. R&D conducted and financed by private businesses. We use a unique dataset on government-funded and private R&D in multiple industries in every OECD country over 23 years. There was a lot of variation over time across countries (and across industries) in the degree of defence spending over this period (see Figure 1). We complement the international industry data with a sample of all R&D performing firms in France together with their R&D subsidies – broken down into defence and other ministries. This longitudinal data allow us to compare the same firm before and after the public R&D award.

The effect of government-funded R&D on privately funded R&D could be positive or negative, depending on whether there is ‘crowding out’ or ‘crowding in’. Crowding out may occur if the supply of inputs to the R&D process (specialised engineers, for example) is in short supply within an industry and country (Goolsbee 1998). In this case, the only effect of an increase in government-funded R&D is to displace private R&D with no net gains for total R&D. On the other hand, crowding in may occur if (1) R&D activity involves large fixed costs and, by covering some of the fixed costs, government-funded R&D makes some marginal private sector projects profitable; (2) government-funded R&D in an industry generates technological spillovers that benefit other private firms in the same industry; and/or (3) firms face credit constraints. Empirically, we find strong evidence of crowding in in both the OECD and French datasets. Increases in government-funded R&D generated by variation in predicted defence R&D translate into significant increases in privately funded R&D expenditures. 

Figure 1 Defence R&D as a percentage of GDP in the US, Germany, Japan, and France

Notes: This figure shows the defence related, government funded total R&D as a share of GDP. The defence R&D in this figure refers to “all public R&D” which includes all government budget appropriations or outlays of total R&D, i.e. not just the government-funded part of business conducted R&D, but also the government funded part of R&D conducted outside of enterprises

To illustrate this, consider the following case study. As can be seen in Figure 1, the 9/11 terrorist attacks induced the Bush administration to suddenly increase military R&D spending in the US. We are interested in what happened to private R&D following 9/11. Figure 2 shows the differential change in private R&D intensity experienced by two ‘defence-sensitive’ industries – aerospace and ICT – compared to the change experienced by industries that are less dependent on defence R&D. Before 9/11, there is no obvious differential trend in private R&D intensity. However, after 9/11, the figure shows a rapid increase in private R&D intensity in the defence-sensitive sector compared to other sectors. The effect of 9/11 appears both statistically significant and economically sizable.

Figure 2 Private R&D intensity in defence sensitive sectors relative to other sectors before and after 9/11 2001, US data

Notes: These coefficients are based on difference in difference regressions 1998-2005. “Defence sensitive sectors” are aerospace and other transport; information technology; and Communication Technologies (Radio, TV and Communications Equipment). We run OLS regressions with industry dummies and time dummies and an interaction between the defence sensitive sectors and different year dummies pre and post 2001. Solid line is the OLS coefficient (base period is 1998) and 95% confidence intervals based on robust standard errors. 

In our systematic analysis across all OECD countries, our estimates imply that a 10% increase in defence R&D results in a 4% increase in private R&D. They imply that defence-related R&D is responsible for an important part of private R&D investment in some industries. For example, in the US ‘aerospace products and parts’ industry, defence-related R&D amounted to $3,026 million in 2002. Our estimates suggest that this public investment results in $1,632 million of additional private investment in R&D. Our estimates also indicate that cross-country differences in defence R&D might play an important role in determining cross-country differences in overall private sector R&D investment. For example, we estimate that if France increased its defence R&D as a fraction of its GDP to the level of the US (admittedly, a large increase), private R&D in France would increase by 8.7%.

We also find evidence of spillovers between countries. In the OECD data, increases in government-funded R&D in one country appear to increase private R&D spending in the same industry in other countries. For example, an increase in government-funded R&D in the US chemical industry induced by an increase in US defence spending in the chemical industry raises the industry’s private R&D in the US, but it also raises private R&D in the German chemical industry. This type of cross-border spillover is consistent with the presence of industry-wide technological or human capital externalities.

When we turn to the effect of investment in R&D on productivity, we find a positive effect on productivity. For example, defence R&D in the US increased by just over half between 2001 and 2004 following the 9/11 attack. We estimate that, holding taxes constant, this translated into a 0.006 percentage point increase of the annual TFP growth rate in the US in the affected years – about a 1.8% increase. Since, in reality, this defence R&D spending had to be financed by increased taxes or cuts in other government expenditures, the ultimate impact is almost certainly smaller.  

Concluding remarks

Overall, our estimates suggest that cross-country differences in defence R&D play a role in explaining cross-country differences in private R&D investment, speed of innovation, and ultimately in   productivity of private sector firms. We caution that our estimates do not necessarily imply that it is desirable for all countries to raise defence R&D across the board. Our finding that government-funded R&D results in increased private R&D does not necessarily imply that defence R&D is the most efficient way for a government to stimulate private sector innovation and productivity. However, it does suggest that it has had some positive effects on civilian innovation (Bloom et al. 2019).


Bloom, N, J Van Reenen and H Williams (2019) “Policies to Promote Innovation”, Journal of Economic Perspectives, 33(3): 163-184

Braddon, D (1999) “Commercial Applications of Military R&D: US and EU Programs Compared”, mimeo, University of the West of England

Congressional Research Service (2018) Government Expenditures on Defense related R&D by the US and other OECD Countries, Washington DC

Goolsbee, A (1998) “Does Government R&D Policy Mainly Benefit Scientists and Engineers?” American Economic Review, 88(2): 298-302.

Lichtenberg, F (1984) “The Relationship between Federal Contract R&D and Company R&D” American Economic Review 74(2) 73-78.

Lichtenberg, F (1988) “Assessing the Impact of Federal Industrial R&D Expenditure on Private R&D Activity in the U.S.”, in P Gummett and J Reppy (eds), The Relation Between Defense and Civil Technologies, Kluwer Academic Publishers: 68-87.

Lichtenberg, F (1995), “The Economics of Defense R&D”. In Hartley, K and Sandler, T. (eds) Handbook of Defense Economics, Volume 1. Elsevier: New York.

Mazzucato, M (2013), The Entrepreneurial State:  Debunking Public vs. Private Sector Myths, Anthem Press

Moretti, E, C Steinwender and J Van Reenen (2019), “The Intellectual Spoils of War? Defense R&D, Productivity and International Spillovers”, NBER Working Paper No. 26483

Mowery, D (2010) “Military R&D and Innovation” in B Hall and N Rosenberg (eds). The Handbook of the Economics of Innovation, Volume 2. Elsevier.

National Science Foundation (2006) National Patterns of R&D Resources (Annual Series). Division of Science Resources Statistics, Washington DC

Ruttan, V W (2006) Is War Necessary for Economic Growth? Military Procurement and Technology Development, Oxford University Press

Senor, D and S Singer (2009) Start-up Nation, Council on Foreign Relations.  

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