One of the more common second-order views held by libertarians is that unions and free markets are antithetical to each other, and indeed that unions are inherently hostile towards free markets. This view goes a long way towards explaining why libertarians as a group tend to be overwhelmingly hostile towards unions, and indeed rarely put any meaningful effort in towards cooperating with unions even where union policy preferences might otherwise closely align with libertarian preferences. To be fair, it is also worth pointing out that many (though not necessarily most) liberals seem to share the fundamental assumption that the survival and strength of private sector unions is dependent on a large amount of state intervention in the economy.
This second-order view, however, is simply wrong and without evidence to support it. Kevin Carson and I previously attempted to address this question last year. In those posts, we explained how unions are placed at a disadvantage by virtue of state intervention, even in some cases where that state intervention is ostensibly pro-labor. These posts traced the history of labor legislation in the United States and showed how federal law has historically been used to suppress unionization in the private sector and the effectiveness thereof, particularly in the wake of the Taft-Hartley Act. Additionally, these posts explained in detail how the strength of unions is very much dependent on their capacity for unpredictability, which government intervention of any sort tends to undermine. Indeed, even prior to the Wagner Act of 1935, when the only federal legislation
Despite this case study of the US, it became clear in comments to my post last week that more than a case study is needed to refute these widely-held assumptions, which, as one commenter stated, are premised on the notion that “As long as there are no barriers of entry, a competitor can always enter the market with non-union wages and drive the union out.”
Fortunately, there is data to demonstrate that unions are quite capable of thriving in free markets, and indeed can do quite poorly in highly regulated markets. We have reliable data on unionization rates in most developed countries thanks to statistics compiled by the OECD.*
Additionally, every year, the Heritage Foundation publishes a ranking of nearly every country in the world on its “Index of Economic Freedom,”** with each country also receiving a raw score. By comparing unionization rates of OECD countries with their Heritage Foundation scores, we can get a pretty good idea of whether and in what direction labor union strength is correlated with the prevalence of free markets (as defined by right-leaning conservatives and libertarians).
Using OECD data for 2008 – the last year for which complete data are available – and the Heritage Foundation’s 2009 index (which would be based upon data for 2008), here’s what we get:

The lines I’ve inserted into the graph represent the OECD averages.
Looking at the numbers more closely, we wind up with a slightly positive correlation between union membership and economic freedom of approximately .19.***
This is hardly a strong correlation, and I probably would not make the claim that it shows that unions succeed most when markets are, broadly speaking, free. However, it does seem to rule out the commonly held notion that unions are inherently opposed to freer markets or that strong unions mean less free markets. [click to continue…]
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