Abstract
This paper employs cost-saving R&D game model to probe into the influencing factors of the R&D input of oligopoly firms. The simulative analysis results show: spillover parameter, market interest rate, firm earnings (without R&D input), profits of R&D failure firms, unit production cost after R&D, and slope coefficient of products demand line are positive influencing factors, and the market interest rate has the biggest influencing range. Profits of R&D firms, number of firms, and unit patent royalty are the negative influencing factors, and the biggest is the number of firms.
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