The Shape of Production Functions and the Direction of Technical Change
从微观基础推导宏观生产函数的形状，发现若创意分布为帕累托分布，则全球生产函数为柯布-道格拉斯形式，且长期技术变革是劳动增强型的。
This pai>er views the standard production function in macroeconomics as a reduced form and derives its properties from microfoundations. The shape of this production function is governed by the distribution of ideas. If that distribution is Pareto, then two results obtain: the global production function is Cobb-Douglas, and technical change in the long run is labor-augmenting. Kortum showed that Pareto distributions are necessary if search-based idea models are to exhibit steady-state growth. Here we show that this same assumption delivers the additional results about the shape of the production function and the direction of technical change.