How did the Clayton antitrust act expand on the Sherman antitrust act?

The Clayton Act made certain practices illegal when their effect was to lessen competition or to create a monopoly.

maintain competition in business

It made certain practices illegal when their effect was to lessen competition to create a monopoly.

Senator John Sherman of Ohio.

Section 1: "Every contract, combination in the form of trust or otherwise, or conspiracy, in restraint of trade or commerce among the several States, or with foreign nations, is declared to be...