There is a fundamental difference between the natural and the social sciences due to reactivity. This difference remains even in the age of Artificially Intelligent Learning Machines and Big Data. Many academic economists take it as a matter of course that economics should become a natural...

Political activism positively affects firm innovation. Firms that support more politicians, politicians on Congressional committees with jurisdictional authority over the firms' industries and politicians who join those committees innovate more. We employ instrumental variables estimation and a...

The U.S. promotes and produces innovation through a wide range of interdependent institutions, ranging from the grant of an intellectual property right to the direct funding of research. The justification for using multiple instruments is intuitively rather simple: no single institution would...

Male and female choices differ in many economic situations, e.g., on the labor market. This paper considers whether such differences are driven by different attitudes towards competition. In our experiment subjects choose between a tournament and a piece-rate pay scheme before performing a real...

This paper surveys the literature on group selection. I describe the early contributions and the group selection controversy. I also describe the main approaches to group selection in the recent literature; fixation, assortative group formation, and reproductive externalities. -- Altruism ; spite...

Dams are essential for water storage and hydropower generation, but change river flow patterns and endanger local environments. Dam projects may further exacerbate already existing problems in trans-boundary rivers. We consider three scenarios of institutional factors: (1) each country pursues...

We examine the efficiency of the standard breach remedy expectation damages in a setting of bilateral cooperative investment by a buyer and a seller. Contracts may specify a required quality level and an upper bound to the cost of production. We find that it is optimal to write an augmented...

We revisit the classical result that financing a pure public good through taxation of private consumption is inefficient. To this standard setup we add a consumption contest in which consumers can win a prize. We show that an appropriately chosen contest - which we call a 'tax lottery' - can...