There are good reasons for this: a change in market power could have important macroeconomic implications. For the euro area, available evidence suggests that the market power of firms located within the single currency area has remained broadly unchanged in recent years.
The positive side of this is that there is little evidence that the euro area has seen a rise in “bad” market power – market power which results in productive and allocative inefficiencies. However, on the negative side, the euro area has also not seen the emergence of superstar firms – highly productive large firms with rising market shares.