Two or more undertakings can be found to enjoy a joint dominant position not only where there exist structural or other links between them but also where the structure of the relevant market is conducive to coordinated effects, that is, it encourages parallel or aligned anti-competitive behaviour on the market.
Is féidir le dhá ghnóthas nó níos mó suíomh ceannasach comhchoiteann a bheith acu sa mhargadh, ní hamháin i gcás ina bhfuil nasc struchtúrach nó naisc eile eatarthu, ach freisin i gcás ina bhfuil struchtúr an mhargaidh lena mbaineann fabhrach d'éifeachtaí comhordaithe, is é sin le rá, spreagtar leis an struchtúr sin iompraíocht frithiomaíoch chomhthreomhar nó ailínithe ar an margadh.