This research demonstrates the opposite of the theory of protectionism in international trade as applied by the Democratic Republic of Congo, which aims in itself the protection of domestic production against foreign competition. When tariff barriers are used as a means of protection, the tariff being a tax, it generates income and most of the least developed African countries, one-third of their tax revenue comes from international trade. But these tariff barriers are justified only in the interest of protecting domestic production against foreign competition. If ever a domestic product would not compete with a foreign like product, there is no reason to apply tariff barriers. This is not the case for the Democratic Republic of Congo, where all foreign products in competition or not with domestic products are hit by import taxes for the sole purpose of maximizing revenue. This situation puts all the weight on the poor consumer who has to pay up to three taxes to buy a basic necessity not produced by the country. We must therefore stop the contrary application of the theory that generates revenues from imports necessary for the survival of the consumer and which sustains the finances of the state on the misery of the population.