Could you point me to the economy models you are refering to?
I think the biggest mistake of the social market economy practised in Germany, was overlooking or disregarding the fact, that policy and policymakers are themselves part of market forces by lobbying, corruption and bribery. This leads to creeping reduction in social standards and development of the economy towards are radical free-market economy, which in turn inevitably leads to feudalism and fascism eventually, as demonstraded live in the US currently.