This paper analyzes the process of Internet diffusion across the world using a panel of 199 countries during the time interval 1990-2004. We group countries in two categories, low and high income countries, and show that the Internet diffusion process is well characterized by an S-shape curve...

There is strong evidence showing that in most countries cities develop sequentially, with the initially largest cities being the first to grow. This paper presents a growth model of optimal city size that rationalizes this growth pattern. Increasing returns to scale is the force that favors...

There exists convincing evidence that democratic countries are less volatile. This conclusion is usually reached with respect to volatility as measured by the standard deviation of annual growth rates of per capita GDP which includes both low and high frequency fluctuations. However, recently...