Where an undertaking has significant market power on a specific market, it may also be designated as having significant market power on a closely related market, where the links between the two markets allow the market power held on the specific market to be leveraged into the closely related market, thereby strengthening the market power of the undertaking.
I gcás ina mbíonn cumhacht sa mhargadh ag gnóthas i dtaca le margadh ar leith, féadfar é a ainmniú freisin ina ghnóthas a bhfuil cumhacht shuntasach aige i dtaca le margadh eile neasghaolmhar, nuair is naisc iad na naisc atá idir an dá mhargadh lenar féidir cumhacht mhargaidh an mhargaidh ar leith a ghiaráil sa margadh a bhfuil dlúthbhaint aige leis agus cumhacht mhargaidh an ghnóthais a neartú dá réir.