What is one of the main differences between a monopoly and an oligopoly? a. oligopolies face downward sloping demand curves, unlike monopolistic firms. b. an oligopoly is a market situation where there are no close substitutes for the good. c. firms in oligopoly can set prices to a degree but must consider other firms' decisions. d. there are barriers to entry for firms in a monopolistic but not in oligopolistic markets.

C. seems to be the closest to the correct answer.

C gets close to the analysis that collusion is common in oligopolies as collusion is (illegal) but easier than competition

A is incorrect as oligopoly has a kinked, not downward sloping curve.

Oligopoly is a market structure where there are limited options for producers, but there are options. So, B is incorrect.

There are barriers to entry in both monopolies and oligopolies so D is incorrect.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.