7. what was needed for successful bartering between settlements?
o a large, wealthy middle class
opeople with specialized skills
the ability to travel between towns
o merchants with specialized goods

I think i's C - ability to travel between towns

b.   jim crow laws were enacted in northern states.

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.