Who was the first common man to be elected president of the united states?
a. james monroe
b. andrew jackson
c. james madison
d. thomas jefferson

Andrew Jackson was the first common man elected into presidency 

Andrew Jackson                                                                                                    because the other presidents were not born to "towns people."

If i’m not mistaken your answer should be the freemen’s bureau started them. i really hope i could ! good luck

high entry costs prevent new producers from entering the market.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.