The standard Hecksher-Ohlin-Samuelson framework claimed that foreign trade benefits developing countries, but many empirical studies suggest otherwise. After analyzing data on income deciles from the World Income Distribution Database for 66 developing countries, we found that trade openness benefits underprivileged people in affluent countries but not in developing countries. Also, external financial flows and democracy in conjunction do not exert significant effects, suggesting that these variables might affect income distribution through different channels. Finally, we reinforce the Kuznets inverted-U hypothesis; namely, the presence of an economic development threshold beyond which low-income deciles would increase.