We investigate the origins of identity and the innate proclivity to draw a distinction between `insiders' and `outsiders'. We propose an evolutionary explanation: we argue that identity arises because it facilitates survival. In an evolutionary setting we endogenize preferences and demonstrate...

We explore the link between affluence and well-being using a simple general equilibrium model with a pure Veblen good. Individuals derive utility from the pure Veblen good based solely on how much they consume relative to others. In equilibrium, consumption of the pure Veblen good is the same...

We analyze the success of filtering as a solution to the spam problem when used alone or concurrently with sender pricing, receiver pricing, or both. We find that filtering alone may exacerbate the spam problem in terms of both the total number of spam message sent and the expected number of...

In their efforts to create a position in a market, and to maintain that position, firms make positioning investments of various sorts, in R&D, plant, advertising, and location, or more generally, in product development and maintenance. The heart of this paper is the hypothesis that the success...