Knowledge that Transforms

Between 1980 and 2005, as the world embraced free market policies, living standards rose sharply, while life expectancy, educational attainment, and democracy improved and absolute poverty declined. Is this a coincidence? A collection of essays edited by Balcerowicz and Fischer argues that indeed reliance on free market forces is key to economic growth. A book by Stiglitz and others disagrees. I review and compare the two arguments.

What are the key determinants of financial development and growth? A large literature debates the relative importance of countries' legal and political environment. In this paper, I present evidence from ancient Rome, where an early form of shareholder company, the societas publicanorum, developed. I show that the societas publicanorum flourished in a legally underdeveloped but politically supportive environment (Roman Republic) and disappeared when Roman law reached its height of legal sophistication but the political environment grew less supportive (Roman Empire). In the Roman case, legal development appears to have mattered little as long as the law as practiced was flexible and adapted to economic needs. The “law as practiced,” in turn, reflected prevalent political interests. After discussing parallels in more recent history, I provide a brief overview of the literature on law and finance and on politics and finance. The historical evidence suggests that legal systems may be less of a technological constraint for growth than previously thought—at least “at the origin.”

Many empirical questions in economics and other social sciences depend on causal effects of programs or policies. In the last two decades, much research has been done on the econometric and statistical analysis of such causal effects. This recent theoretical literature has built on, and combined features of, earlier work in both the statistics and econometrics literatures. It has by now reached a level of maturity that makes it an important tool in many areas of empirical research in economics, including labor economics, public finance, development economics, industrial organization, and other areas of empirical microeconomics. In this review, we discuss some of the recent developments. We focus primarily on practical issues for empirical researchers, as well as provide a historical overview of the area and give references to more technical research.