Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'High-income Americans are much more likely than those with lower incomes to know the level of the Dow and to know that Ben Bernanke is the Federal Reserve chairman .', Argument/Subject 1: 'bernanke', Argument/Subject 2: 'federal reserve'
be chairman of