What was Alexander the Great's military strategy called?

The formation of business monopolies in the late 1800s was made possible by the (1) effects of laissez-faire policies (2) passage of federal antitrust laws (3) elimination of the free-enterprise system (4) adoption of socialist economic practices

Don’t mind the already marked answer but taking it now

Space is not completely empty. there are small particles in space. what happens when these particles come together?