Abstract
The migration out of Europe and the establishment of North American colonies presents us with a great puzzle: why did the colonists establish democratic forms of governance? Considering that early democratic colonies appeared even before philosophical works such as those of Locke and Montesquieu were written, it is difficult to make the case that ideology was the driving factor. We show that the calculus of consent model proposed by Buchanan and Tullock (The calculus of consent, Liberty Fund, Indianapolis, 1962) offers a simple but subtle solution this puzzle. Because migrants formed much more homogeneous communities, and because, thanks to the large geographical expanse, the inter-jurisdictional externalities were small, the efficient level of consensus within each colony was much greater than in Europe, and the scope of efficient centralized decision-making was much smaller. Hence, a structure of decentralized democratic communities emerged as the efficient outcome.
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Notes
Mathematically, this means that \(\delta D\) and \(\delta E\) are inexact differentials, i.e. they (as well as their integrals) are path dependent. They depend not just on the sheer number of people (or jurisdictions), but also on which people (jurisdictions) specifically are added (or subtracted). For example, adding a small group of people that is culturally very different from the existing population, would increase the decision-making costs much more than adding a small group of the same size but of culturally similar people.
We can also think of this through the lens of knowledge rather than incentives (Page 2007). The external cost of a collective decision is due to taking a mistaken decision. This is made less likely if more points of view are included, hence avoiding groupthink. But if the population is relatively homogeneous, more people are needed for securing a diversity of viewpoints. If the population is relatively heterogeneous, even a small (random) sampling will lead to a diverse set of perspectives.
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Acknowledgements
We thank Peter Boettke, Geoffrey Hodgson, Peter Leeson, Georg Vanberg, Richard Wagner and two anonymous reviewers for their comments on earlier versions of this paper. We also gratefully acknowledge the financial supportfrom the Mercatus Center at George Mason University, The Institute for Humane Studies, and the Earhart Foundation. Earlier versions of this paper were presented at the Public Choice Society conference in 2014, and at the Association for Private Enterprise Education conference in 2013.
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Appendix
Appendix
The simplest case of decreasing external costs and increasing decision-making costs is when the marginal costs, \(\delta E/\delta n\) and \(\delta D/\delta n\), are proportional to the current levels of the costs, \(E\) and \(D\):
\(h\) and \(g\) are positive. This means: (a) in terms of external costs, we have diminishing returns from increasing the deciding group; and (b) in terms of decision-making costs, in line with Olson’s (1965) logic of collective action, the bigger the group, the less likely it is that one can personally affect the decision of the group, and, hence, it is increasingly more difficult to motivate people to become involved in the decision making process or to seek a convergence to complete consensus.
Under this assumption, we find the following mathematical forms for the external costs and for the decision-making costs:
where \(h\) and \(g\) are two measures of homogeneity, and \(E_{0}\) and \(D_{0}\) are the costs under pure authoritarian rule (i.e. when \(n \to 0\)). The model is entirely agnostic with respect to why homogeneity may change, e.g. due to changes of the group size or just of the internal composition, and, hence, can be applied to a wide range of cases.
The equilibrium decision rule, minimizing total cost, \(E + D\), is:
Proof of Theorem 1
\(\square\)
Proof of Theorem 2
\(\square\)
Constants \(h\) and \(g\) are not independent. As discussed in the main text, homogeneity manifests itself both in the realm of external costs and in the realm of decision-making costs. Let \(g = \alpha h\), where \(\alpha\) is a positive scaling constant accounting for the possibly different strength with which homogeneity impacts external and decision-making costs. Consequently,
Lemma 1
The external costs curve always starts above the decision-making curve.
Proof
The level of consensus is always positive, \(n^{*} > 0\), which implies that \(E_{0} > D_{0} .\)\(\square\)
Lemma 2
The scaling parameter\(\alpha\)is always greater than\(\frac{{D_{0} }}{{E_{0} }}\).
Proof
\(n^{*} = 0 \Rightarrow \forall h, \alpha = \frac{{D_{0} }}{{E_{0} }}\) The level of consensus is always positive, \(n^{*} > 0\), which implies that \(\alpha > \frac{{D_{0} }}{{E_{0} }}\). This is illustrated in Fig. 5.\(\square\)
Proof of Theorem 3
\(\square\)
This is always positive because of the Lemmas 1 and 2. Hence, as homogeneity increases, the efficient level of consensus also increases. As shown by Fig. 5, the sensitivity of the efficient level of consensus with respect to homogeneity increases as a function of the scaling factor \(\alpha\).
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Tarko, V., O’Donnell, K. Escape from Europe: a calculus of consent model of the origins of liberal institutions in the North American colonies. Const Polit Econ 30, 70–95 (2019). https://doi.org/10.1007/s10602-018-9264-3
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DOI: https://doi.org/10.1007/s10602-018-9264-3