via VoxEU, is see that Paolo Epifani and Gino Gancia have a paper out, forthcoming in REconStd, Openness, Government Size and the Terms of Trade:
This paper investigates the relationship between trade openness and the size of
governments, both theoretically and empirically. We argue that openness can increase
the size of governments through two channels: (1) a terms of trade externality, whereby
trade lowers the domestic cost of taxation, and (2) the demand for insurance, whereby
trade raises risk and public transfers. We provide a uni
ed framework for studying
and testing these two mechanisms. Our main theoretical prediction is that the relative
strength of the two explanations depends on a key parameter, namely, the elasticity of
substitution between domestic and foreign goods. Moreover, while the
first mechanism
is inefficient from the standpoint of world welfare, the second is instead optimal. In
the empirical part of the paper, we provide new evidence on the positive association
between openness and government size and we explore its determinants. Consistently
with the terms of trade externality channel, we show that the correlation is contingent
on a low elasticity of substitution between domestic and foreign goods. Our
findings
raise warnings that globalization may have led to ineffciently large governments.
As they write at VoxEU:
More open countries have larger public sectors because the cost of
providing public goods is lower the higher a country’s involvement in
foreign trade. The basic idea is that an expansion of the public sector
crowds out private production, thereby reducing the domestic supply of
exports. As long as the world demand for domestic products is downward
sloping, a fall in domestic exports brings about a terms-of-trade
improvement that partly compensate the increase in public expenditures.
In other words, the rise in export prices shifts some of the costs of
the public sector onto foreign consumers. This effect is stronger in
more open economies, because the real-income effect of terms-of-trade
movements is proportional to the volume of trade. Moreover, such a
terms-of-trade improvement materialises independent of whether a
country is large or small, provided that it produces differentiated
goods. For instance, given that Nokia’s mobile phones are perceived as
different from Motorola’s, even a country as small as Finland is a
price setter in world markets. Hence, insofar as the price of a Nokia
mobile reflects high domestic taxes, every unit sold to foreigners
provides a subsidy to the Finnish welfare state.
In our data, we find that the positive correlation between openness
and government size holds strongly only for countries producing
differentiated products. Moreover, simple calibrations suggest that the
mechanism illustrated above is quantitatively relevant, as it can
explain the entire empirical correlation between openness and
government size, and between one-third and one-half of the overall
average increase in public spending over the second half of the last
century.
That the growth in governments’ size is driven by terms-of-trade
considerations may appear implausible at first. It is less so once it
is understood that terms of trade and relative wage are closely related
in open economy, for any policy that increases the relative demand for
domestic labour also affects positively the terms of trade. This is
indeed the case with public expenditure. A shift in the composition of
expenditure from private to public raises the relative demand for
domestic labour, because public goods and services are produced almost
entirely locally, whereas private goods are partly imported. Evidence
on this is compelling. In a sample of developed and developing
countries with available data, we find that the average import share in
government consumption is 1%, versus an economy-wide import share equal
to 50%.
Hence, the logic behind our results is closely related to the
Keynesian view that public expenditure can be used to sustain demand
for domestic labour. The current crisis offers numerous examples of how
globalisation affects this logic. For instance, when asked how to give
a stimulus to the US economy, a PIMCO spokesman said: "Consumers will
just buy more Chinese goods with stimulus package money, more of the
same. What is needed is public investment to fill demand void of
private sector". This is the mechanism we stress in action. In a world
of integrated product markets, sustaining demand via public spending is
considered more effective than a tax cut.
I need to look into this more. Their results do seem to show up in the standard version of the differentiated trade model people use now, but that model has all sorts of weird simplifying features that means one has to think seriously about how robust results are and how applicable to the real world.
My first concern is that differentiated producers like Nokia already fully exploit their market power and that hence there is little government can do to impose an additional pecuniary externality on the rest of the world. At least one would want to look into the issue of how firms and the government interact in setting prices, both statically and dynamically, in differentiated goods industries with firm specific capital (and consumer habits). Which reflects one of my pet peeves about this literature, the lack of dynamic demand systems with distinct short and long-run demand.
Update #1: Another paper from the same authors that also works through what appears to be a model very close to the standard model, though I should check: Procompetitive Losses from Trade
We argue that the procompetitive effect of international trade may bring about significant welfare costs that have not been recognized. We formulate a stylized general equilibrium model with a continuum of imperfectly competitive industries to show that, under
plausible conditions, a trade-induced increase in competition can actually amplify monopoly
distortions. This happens because trade, while lowering the average level of market power,
may increase its cross-sectoral dispersion. Using data on US industries, we document a
dramatic increase in the dispersion of market power overtime. We also show evidence that
trade might be responsible for it and provide some quanti
cations of the induced welfare
cost. Our results suggest that, to avoid some unpleasant effects of globalization, trade
integration should be accompanied by procompetitive reforms (i.e., deregulation) in the
nontraded sectors.