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		| Robin  Cowan | 
	
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		| ''On the Number of Firms and the Quantity of Innovation'' | 
	
		| ( 2002, Vol. 12 No.6 ) | 
	
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		| This paper models a dynamic innovation process to examine the  relationship between levels of R and D and market structure.  In  contrast to most of the literature, here R and D increases  firms' knowledge stocks, making future R and D less costly.  This   s a feedback by which market structures can affect levels of  R and D. In general while an increase in the number of firms reduces R and D per firm, industry R and D increases.  The model also endogenizes  the number of firms using a zero profit condition. | 
	
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		| Keywords: | 
	
		| JEL: L1 - Market Structure, Firm Strategy, and Market Performance: General L2 - Firm Objectives, Organization, and Behavior: General
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		| | Manuscript Received : Mar 07 2002 |  | Manuscript Accepted : Apr 19 2002 | 
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