The Intellectual Spoils of War? Defense RD, Productivity and International Spillovers
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Government-funded R&D, particularly in defense, significantly influences private sector R&D and productivity growth. A 10% increase in government-financed R&D leads to a 4.3% rise in privately funded R&D, indicating a “crowding in” effect rather than “crowding out.”.
new Moretti/Van Reenen finds that government funded R&D results in “crowding in” a 10% increase in government-financed R&D generates 4.3% additional privately funded R&D and that this spending does result in “significant” but not “overwhelming” productivity gains. They estimate an increase in the defense R&D to value added ratio of one percentage point is estimated to cause a 5% increase in the yearly growth rate of TFP (e.g., from 2 percent per annum to 2.1 percent).
“…In the US and many other OECD countries, expenditures for defense-related R&D represent a key policy channel through which governments shape innovation, and dwarf all other public subsidies for innovation. We examine the impact of government funding for R&D – and defense-related R&D in particular – on privately conducted R&D, and its ultimate effect on productivity growth. We estimate models that relate privately funded R&D to lagged government-funded R&D using industry-country level data from OECD countries and firm level data from France. To deal with the potentially endogenous allocation of government R&D funds we use changes in predicted defense R&D as an instrumental variable. In both datasets, we uncover evidence of “crowding in” rather than “crowding out,” as increases in government-funded R&D for an industry or a firm result in significant increases in private sector R&D in that industry or firm. A 10% increase in government-financed R&D generates 4.3% additional privately funded R&D. An analysis of wages and employment suggests that the increase in private R&D expenditure reflects actual increases in R&D employment, not just higher labor costs….Increases in government-funded R&D generated by variation in predicted defense R&D translate into significant increases in privately-funded R&D expenditures, with our preferred estimates of the elasticity equal to 0.43. Our estimate implies that defense-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, defense-related R&D amounted to $3,026 million in 2002 (nominal). 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 defense 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 defense R&D to the level of the US as a fraction of its GDP (admittedly a large increase) private R&D in France would increase by 8.7%. The increases in private R&D expenditures appear to reflect actual increases in R&D activity, not just higher wages and input prices caused by increased demand. We uncover significant positive effects on employment of R&D personnel in both datasets, with limited wage increases. This is consistent with a fairly elastic local supply of specialized R&D workers within an industry across countries, or across industries…..Our estimates imply that some of the existing cross-country differences in private R&D investment are due to cross-country differences in defense R&D expenditures. We also find evidence of international spillovers, as increases in government-funded R&D in a particular industry and country raise private R&D in the same industry in other countries. Finally, we find that increases in private R&D induced by increases in defense R&D result in significant productivity gains….We estimate models where measures of productivity growth – growth in TFP or output per worker – are regressed on lagged private R&D intensity, using predicted defense R&D as a share of value added or sales as an instrumental variable. Industry-level models based on OECD data indicate a positive effect of private R&D on TFP….An increase in the defense R&D to value added ratio of one percentage point is estimated to cause a 5% increase in the yearly growth rate of TFP (e.g., from 2 percent per annum to 2.1 percent). We view this as an important, but not overwhelming effect.It suggests that a fraction, although certainly not all, of US economic growth is accounted for by investment in defense R&D. For example, defense R&D in the US increased by 52% between 2001 and 2004 following the 9/11 attack. Compared to historical standard, this was a very large increase. 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 defense R&D spending had to be financed by increased taxes or cuts in other government expenditures, the ultimate impact is almost certainly smaller.…”
Enrico Moretti, Claudia Steinwender, John Van Reenen, “The Intellectual Spoils of War? Defense R&D, Productivity and International Spillovers,” National Bureau of Economic Research, November 2019, https://www.nber.org/papers/w26483



