The ECB’s inflation target is formulated in terms of headline inflation. However, domestically determined inflation features prominently in the monetary policy transmission mechanism and in gauging underlying inflation, making it important to assess it regularly. The ECB monitors various proxies for domestically determined inflation, including: (i) “domestic inflation”, which aggregates inflation items with a low import share; and (ii) “Supercore” inflation, which aggregates inflation items found to be sensitive to the aggregate business cycle.