We document the evolution of product innovation and features in the mobile telephone handset market. We distinguish between two types of product innovation: vertical and horizontal innovation. Using data from 1990 - 2003, we find that some characteristics have subsequently become an industry...

This paper discusses the problem of monetary policy transparency in a simple static robust control framework. In this framework, we identify two sources of monetary policy uncertainty. First, we identify the uncertainty about the central bank’s inflation stabilization preferences, which...

We document the evolution of product innovation and features in the mobile telephone handset market. We distinguish between two types of product innovation : vertical and horizontal innovation. Using data from 1990 - 2003, we find that some characteristics have subsequently become an industry...

The nonlinear convex programming problem of finding the minimum covering weighted ball of a given finite set of points in <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$${\mathbb{R}^n}$$</EquationSource> </InlineEquation> is solved by generating a finite sequence of subsets of the points and by finding the minimum covering weighted ball of each subset in the sequence until...</equationsource></inlineequation>

For a finite player cooperative cost game, we consider two solutions that are based on excesses of coalitions. We define per-capita excess-sum of a player as sum of normalized excesses of coalitions involving this player and view it as a measure of player's dissatisfaction. So, per-capita...