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Eco prep(help!)-Expenditure on R+D in Oligopoly

I have to make a mini presentation.
Expenditure on Reaserch and Development in Oligopoly.
The A-Z Eco dictionary states that the firms most likely to spend on R and D are the ones in an oligopoly situation, where new product development can confer significant advantages. What kind of advantages will there be? and any disadvantages? Anyone???? :confused:

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