Question

question 7
what factor helped hollywood studios rule the marketplace in the 1920s?
thomas edisons financial backing
the development of visual effects training schools
the vertical integration of production, distribution, and exhibition
the political support of local democrats

Explanation:

In the 1920s, Hollywood studios' vertical - integration of production, distribution, and exhibition allowed them to control the entire film - making process from creation to screening, giving them a dominant position in the marketplace. Thomas Edison's influence waned by then, visual effects training schools were not a major factor at that time, and political support from local Democrats was not a key element in their market dominance.

Answer:

the vertical integration of production, distribution, and exhibition