99
The problem that competition law faces
in these settings is similar to the one faced by
multi-sided platforms when conducting busi-
ness – in essence, how to strike a balance be-
tween the two sides, in this case the offensive/
anti-competitive and the defensive/pro-com-
petitive.
In what follows, I will contend that whereas
it is clear in economics that business practices
in multi-sided platforms setting have both an
offensive and defensive potential, and where-
as this seems to have been acknowledged on
a theoretical basis by competition authorities
and courts, the practical application of the
competition rules results in an imbalance that
overplays the offensive, or anti-competitive, po-
tential of such practices and makes defences
effectivelyunavailable.
Multi-sided market features
as a sword
Competition authorities have been aware
since the early 1990s of the offensive potential
of network effects, including in multi-sided plat-
form settings.
Interestingly, both the doctrine and the appli-
cation of the law in the face of network effects
have tended to focus on their anti-competitive
potential (which is somehow paradoxical for a
positive, theoretically desirable, externality). In-
deed, most of the attention paid to network ef-
fects by antitrust enforcers and scholars – later
consolidated in precedents and guidelines
12
–
eminently relates to their characteristic as a bar-
rier to entry. As a result, network effects have
proved to be, in practice, a most effective basis
for legal arguments challenging allegedly an-
ti-competitive conduct.
13
This has been evident with regard to a wide
array of practices, both price and non-price re-
lated, as well as in relation to merger control.
11 HJ Hovenkamp, The Antitrust Enterprise, Principle and
Execution (Harvard University Press, 2005), at 281 (‘These same
features that make networks attractive also create the opportunity for
anticompetitive practices’); M Schanzenbach, ‘Network Effects and
AntitrustLaw:Predation,AfrmativeDefenses,andtheCase ofU.S.
v. Microsoft’ (2002)4 Stanford Technology Law Rev 3 (asserting that
‘network competition provides unique opportunities for anti-competi-
tive strategies’, but emphasises that ‘network competition also provides
someuniquepro-competitivejusticationsforpracticesthathavetra-
ditionally received antitrust scrutiny, such as tying, exclusive dealing,
and low-pricing strategies’, concluding that ‘network effects can be
a double-edged sword’); GL Priest, ‘Rethinking Antitrust Law in
an Age of Network Industries’ (2007) 4 Yale Law & Economics Re-
search Paper No 352, at 4 (‘[M]any practices in the context of networks
that may seem puzzling become understood when the need to correct
for positive network externalities is taken into account’); DJ Gifford,
‘The European Union, the United States, and Microsoft: A Comparative
Review of Antitrust Doctrine’, CLEA 2009 Annual Meeting Paper,
available at SSRN: http://ssrn.com/abstract=1434089or http://dx.doi.
org/10.2139/ssrn.1434089,pp 19–20: ‘Network effects carry a double
edge’; SF Ross, ‘Network Economic Effects and the Limits of GTE
Sylvania’sEfciencyAnalysis’(2001) 68AntitrustLaw Journal951:
‘Firms that produce goods with network effects can engage in con-
ductthatpromotesefciency,inthesensethattheresultingproductis
cheaper, intrinsically superior in quality, or that the product’s greater
use by others increases each consumer’s utility. The same conduct can
simultaneouslyhave signicant exclusionaryeffectsbecause thecon-
ductmakesitevenmoredifcultfornewentrantstoovercomethefact
that so many consumers now use the dominant rm’sproduct’; WH
Page, ‘Microsoft and the Limits of Antitrust’ (2009) Journal of Com-
petition Law & Economics (forthcoming), University of Florida
Levin College of Law Research Paper No 2009–40, available at SSRN:
http://ssrn.com/abstract=1501079,at 9: ‘The very existence of network
effects makes certain practices that resemble antitrust violations social-
lybenecial…’;WJKolasky,‘NetworkEffects:AContrarianView’
(1999) 7 George Mason Law Review 578: ‘Network effects may
well exhibit unique characteristics, but these characteristics do not all
point in one direction. Network effects will as often provide a valid
precompetitivebusinessjusticationforconductastheywillareason
for holding otherwise lawful conduct unlawfully’.
12 European Commission, Guidance on the Commission’s en-
forcement priorities in applying Article 102 TFEU to abusive exclu-
sionary conduct by dominant undertakings, paras 17–20 (‘The Com-
mission will normally intervene under Article 82 where, on the basis of
cogent and convincing evidence, the allegedly abusive conduct is likely
to lead to anti-competitive foreclosure. The Commission considers the
following factors to be generally relevant to such an assessment: (…)
the existence of economies of scale and/or scope and network effects.
Economies of scale mean that competitors are less likely to enter or
stayinthemarketifthedominantundertakingforeclosesasignicant
part of the relevantmarket. Similarly, the conduct may allow the dom-
inant undertaking to ‘tip’ a market characterised by network effects in
its favor or to further entrench its position on such a market. Likewise,
ifentrybarriersintheupstreamand/ordownstreammarketaresigni-
cant, this means that it may be costly for competitors to overcome pos-
sible foreclosure through vertical integration’), 24; Guidelines on the
assessment of horizontal mergers under the Council Regulation on the
control of concentrations between undertakings (2004) OJ C 31/5, para
72; Guidelines on the assessment of non-horizontal mergers under the
Council Regulation on the control of concentrations between under tak-
ings (2008) OJC265/6,paras62,101.