R&D Subsidies and Economic Growth
构建内生增长模型，发现当研发活动存在递减回报时，对模仿性研发的补贴会降低经济增长速度。
We present an endogenous growth model in which some firms devote resources to developing higher-quality products (innovative RD imitative R&D subsidies actually lead to slower economic growth. A key assumption driving these conclusions is that R&D activities are subject to decreasing returns. When R&D activities are subject to constant returns, as is commonly assumed, the only equilibrium with both innovation and imitation is unstable.