It is indeed very hard to fault the Scandinavian countries, both in their economic development and with their social successes. (Although Norway has been helped immensely by its off-shore oil industry). The example of countries such as Sweden and Denmark tends strongly to suggest that a Mixed Economy works best.
It is not what you think. Sweden was very open and laissez-faire for about 100 years before the government interventions. You get the best growth, the best standard of living increases with free markets. Take a look at the video below. The Swedish economist jokes in relation to Sweden: ‘How do you get a small fortune? Start out with a big one and make mistakes.’
https://www.youtube.com/watch?v=5gvVPBBDpV8
And this one:
https://www.youtube.com/watch?v=G9WOMQMkMQc
That contrasts with the disastrous attempts in the late 1980s / early 1990s to implement a Free Market Economy in this country. (An experiment that is still often referred to as "Rogernomics", after the then minister of finance, Roger Douglas). During the 1980s, economist Milton Friedman gave a series of rather forceful lectures on TV about the virtues of the "Free Market". After that, wondrous claims were made about what it was going to achieve - and for a few years, many people actually believed it, too!
However, the reality was quite different; with just one example of many being the "Leaky Homes" debacle.
Again, this is not what it appears to be. There was a huge government manual that described all the building standards for New Zealand. It was called NZ Standard 3604. It was not the case of deregulation. The author of the source below mentions the creator of the new regulations by name and tends to think he knew nothing about construction. I'm sure he had good intentions though. Everyone followed them because…well, that’s the government’s standard. More government failure being passed off as the market’s fault. Since the new regulations happened around the same time as the deregulation in other things, well, post-hoc ergo propter hoc. Take it from a NZ builder:
http://pc.blogspot.com/2009/11/leaky-homes-part-1-myth-of-deregulated.html
MMM