Which was not a key achievement of the ming dynasty A. the expansion of china's borders
B. the voyages of Zheng He
C. the improvement of roads and canals
D. the rebuilding of the great wall

can someone just answer this

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answer;

monopolies are a threat to the american way of life.

explanation;

-a monopoly is a business that is the only provider of a good or service, giving it a tremendous competitive advantage over any other company that tries to provide a similar product or service.

-monopolies restrict free trade, preventing the market from setting prices. since monopolies are lone providers, they can set any prices they choose. that's known as price-fixing, and they can do this regardless of demand because they know consumers have no choice.

-not only can monopolies raise prices, but they also can supply inferior products. monopolies create inflation. since they can set any prices they want, they will raise costs to consumers. it's called cost-push inflation.