1. against a permanent combination of businesses, now illegal, for the purpose of controlling the production or price of some good antitrust 2. the merging of businesses into one large organization urbanization 3. the mass movement of rural people to the urban areas of the country. consolidation

The answer for 1 is Antitrust

Trusts were when a number of companies make a deal to exploit the system while not harming each other and basically they start dictating the prices and the market, making it harder for anyone to join the market and making things more expensive for the workers. Antitrust laws fight against trusts and monopolies.

The answer for 2 is consolidation

This is when two companies become a single company in order to increase their efficiency since they start serving both the client bases of the respective companies. Commonly, a new company is opened which owns both companies, an example being Activision-Blizzard, which owns both Activision and Blizzard.

The answer for 3 is urbanization

When people from rural areas move towards cities, cities grow and urbanization occurs. Historically, this has happened mostly due to employment opportunities. For example, when factories started growing in New York the population tripled, right after the Civil War.