Much of the recent larger gap is due to differences in the coverage of healthcare services and to differences in the weight accorded to housing services and health-care services. The CPI only covers out-of-pocket expenditures for health-care services, while the PCE index covers a much broader range of spending.
There is an urgent need for all jurisdictions to agree to a set of harmonized equivalence criteria to avoid any unintended consequences. Conclusion 43.