Your own work can explain this difference when the US has a central fiscal authority that can spend and redistribute across states while Eurozone states are revenue constrained (involuntarily)and operating under a euro standard controlled solelely by the ECB.
Warren,
Your own work can explain this difference when the US has a central fiscal authority that can spend and redistribute across states while Eurozone states are revenue constrained (involuntarily)and operating under a euro standard controlled solelely by the ECB.