In chicago's southside (and other places), auto mechanics (who work outside the formal sector, without a business license, advertising, or even a garage) will do work for gang members without charging them. in exchange, gang members chase away other mechanics who wish to operate in the area. these auto mechanics have monopoly power; what type of source does it come from?

barrier and network externalities monopoly power

Explanation:

This is platform were other potential competitors in same trade are discouraged from entering into the same market(by gang members) area thereby giving them monopolistic power over the area where their business operates.

answer; cattle ranching on the savanna,and forestry in the amazon;

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.