Sentence:  According to O'Donoghue & Padilla (2006) 168–69, the concept of superdominance is problematic, given that there is no objective economic test that makes it possible to define when a company is <WSD>superdominant</WSD> and its behaviour should be subjected to greater scrutiny. 
Meaning of the word marked with <WSD> tags:  Having an overwhelming proportion of market share, so as to be almost a monopoly.