An alternative mechanism by which trade and labor market distortions a
ffect national income is introduced, namely, the effects of these dist
ortions on the efficiency of investment. For the typical structure of
protection of developing countries, the income losses due to reduced i
nvestment efficiency caused by trade distortions are likely to be many
times larger than conventional losses. The potential synergistic (neg
ative) effects of combining trade and labor market distortions commonl
y observed in developing countries are also emphasized. The main concl
usion is that income losses of even moderate trade and labor distortio
ns are likely to be much greater than usually presumed.