"He's been seriously considering the notion that every billionaire is a policy failure, saying "there can be no doubt that the thrust of the argument is correct — that in a country where so many people are barely getting by, or not getting by at all, an economy that mints billionaires is structurally deficient. There is no reasonable moral or practical justification for these disparities in wealth and income."
Quite surprisingly, the man quoted in the text above is a _____ himself.
Transitions are very important in English. Focus on the transition "Quite surprisingly," to know the only logical answer.