From Dr Arnold Kling: "The theory is that there is a discrepancy between trends in knowledge and power. Power in the United States is remarkably concentrated. We are creating increasingly specialized knowledge, which means that the information needed to make good decisions is located outside of Washington, D.C. And yet we have a central government attempting to do for 300 million people what governments in places like Singapore, Hong Kong, Denmark, and Switzerland do for many fewer people.
I do not wish to contend that government is better in those countries than in the U.S. But if there were scale efficiencies in government services beyond the level of 10 million people, then we would expect governments in small countries to be much, much worse than in the U.S. The fact that Singapore, Hong Kong, Denmark, and Switzerland function at all is proof that a 300-million scale polity is not necessary to run an effective social insurance system, an effective education system, etc."
Why the U.S. is Ungovernable, Arnold Kling | EconLog | Library of Economics and Liberty