How did the cuban effect the relationship between the united states and soviet union? ?

If you mean the cuban missile crisis, the it definitely strained the relationship between the US and the USSR even more. It was one of those times where the Cold War got hot amd also the closest to nuclear war we've ever gotton during thr Cold War. It was a proxy conflict where the US caused more havoc and caused Russia to back up Cuba

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.

Ibelieve it would be d hoped this !