Does black markets function same way in whole world

The music of the baroque period is the first to be among the musical pieces that people today are generally familiar with

Nazis who forced jews to live in ghettos also forced them to

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