The laziest way to explain the rigidities is to just blame someone else, most of the time governments. However, getting rid of goverments doesn't seem to get rid of all rigidity because, as it turns out, our physical world is constrained by more than just politics. What's often forgotten is that governments can also fight against natural forces that reduce flexibility in the economy. Therefore the answer is neither more government or less government. No it's the usual boring answer. What we need is better governments. It's like a supply and demand situation. There is demand for a certain size of government and the supply is often either too high or too low. The goal is to find a balance.