Although it is not possible, in general, to give a macro description of a micro model over the entire state space of the micro model, it is possible to aggregate exactly over a subspace. The set of micro states where aggregation is possible forms the aggregation set. The paper considers the...

Journal rankings are important for evaluating research output, for academic promotions, and for allocating funds. Examining the assignment of economics journals to different quartiles of citation-based rankings, the authors found that about 60% of journals remain in the same quartile and about...

This paper addresses the institutional concentration of authors in 15 top economics journals from 1977 to 1997. The concentration of authors' PhD affiliations is substantially higher than the concentration of authors' current affiliations. Relating input indicators, such as population, number of...