Which was one way businesspeople tried to eliminate competition?

I guess the question is asking about the 1800s. Business people in the 1800s endeavored to eliminate competition by framing pools, trusts, syndication or monopolies etc. Numerous organizations composed pools to keep costs at a specific level, that is, they endeavored to shield costs from falling. A few organizations shaped trusts. A trust is a blend of firms or companies shaped by a legitimate understanding, particularly to lessen competition.