VERTICALLY INTEGRATED UNIT LABOR COSTS BY SECTOR MEXICO AND USA 1970-2000 * PABLO RUIZ-NÁPOLES Professor of Economics Universidad Nacional Autónoma de México UNAM Av. Universidad 3000 - 1er. Piso, Ciudad Universitaria México, D. F., 04510, México E-mail: ruizna@servidor.unam.mx * This work is a result of a research project funded by UNAM, PAPIIT no. IN313202-2. The author acknowledges and thanks the assistance of David Díaz and Jesús Santamaría, undergraduate students at UNAM, the technical advice of Martín Puchet, Armando Sánchez and Valentín Solís, colleagues at UNAM, and the commentaries of Juan Carlos Moreno, regional advisor at ECLAC, UN. All the errors in this work are the sole responsibility of the author.