When I was talking about centralized government, I didn't mean central economic planning. (Did you?) I just meant that modern governments have well-defined centralized control over (usually) a good-sized region and population.

I see centralized government as implying more central economic planning as well as more pervasive state intervention in all areas of life. I contrast it to a more federalized or devolved allocation of political power. I believe a complex economy is compatible with government that is more federal and less centralized than the modern United States and even less centralized than the European Union. I don't believe that the stability, security and free movement of trade and labour that are foundations of a complex modern economy require ever more centralized political power, although historically both have tended to increase alongside one another more often than not.