Since the growth rate is of central importance to policy, how can one decide who is right about what the trend growth rate for policy should be? If any realistic solution to the structural stagnation...

Since the growth rate is of central importance to policy, how can one decide who is right about what the trend growth rate for policy should be? If any realistic solution to the structural stagnation problem involves both tax increases and entitlement cuts, why do both sides have such a difficult time coming to a compromise that will deal with our budget dilemma or with providing a safety net for those most hurt by globalization?