10. what is vertical integration?
o a system of consolidating many firms in the same business
o a system of manipulating stock prices
o a system of controlling all the businesses in the various phases of production
o a system of shared ownership among different companies

The answer is a system of controlling all the businesses in the various phases of production.

Explanation:

This can be simply defined in another way too. Vertical integration means that various firms and organizations in the different stages of the Supply Chain being integrated. That is more like the integration between a manufacturer, its suppliers and distributors.

On May 4, 1886, a labor protest rally near Chicago's Haymarket Square turned into ariot after someone threw a bomb at police. ... The Haymarket Riot was viewed a setback for the organized labor movement in America, which was fighting for such rights as the eight-hour workday.