Studied the assignment of economics journals to different quartiles of citation-based rankings, a measure of journal quality that has implications for evaluating research output and academic promotions. Found that about 60% of journals remain in the same quartile, and about 95% remain the same or move up within 5- to 10-year intervals, suggesting that, for practical purposes, reassignment of journal quality categories every 5 to 10 years suffices. (SLD)