In a free market, supply and demand determines?

What do historians call the political,social,or cultural circumstances surrounding an event?

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire

When a county and a city work together to run a school district, they have organized a