A recent Associated Press article described a class action discrimination lawsuit by female teachers against the New York City Public Schools asserting that male high school teachers are systematically paid more than female high school teachers. Assume you are on the legal team for one side and in charge of working with the economist hired as an expert witness to provide evidence backing your position. What information would the economist need and how would she show the existence or non-existence of wage discrimination? (In your answer, define wage discrimination and explain how the required information relates to this definition.)