Act ( 15 U.S.C. 18 ) is amended by inserting or a monopsony after monopoly each place that term appears. 4. Study on monopsony power in labor markets Not later than 2 years after the date of enactment of this Act, the Comptroller General of the United States shall conduct and publish a study incorporating public comment on the economic and social effect of rising concentration in labor markets, including the impact of monopsony power on the wages and benefits, mobility, and income equality of workers, including employees and independent contractors.