This paper examines the claim that US bus transit productivity has dec
lined in recent years. It does so with reference to a piecewise-linear
best-practice (DEA) production frontier, computed for multi-modal bus
transit between 1988 and 1992. Efficiency is measured both by a Russe
ll (static) and Malmquist (dynamic) measure of productivity change. Th
e principal finding is that, overall, bus transit efficiency has impro
ved slightly over the period.