In an article entitled "'Buy America' in the Stimulus (But good luck with that)", by Louis Uchitelle, Jonathan M. Feldman is quoted:

Take mass transit. The Obama stimulus would designate a chunk of money for the upgrading or expansion of mass transit systems, in part through the purchase of new subway and light rail cars. No American manufacturer makes these cars, although three foreign companies assemble them at plants in the United States, mainly from components manufactured abroad, according to Jonathan M. Feldman, an American economist at Stockholm University, whose research focuses on mass transit.

“The assembly operations represent only 10 percent of the total value added,” Mr. Feldman said. “The rest is embedded in the components, made overseas.”