Developing nations in particular often lack the institutional machinery needed for effective imposition of income or corporation taxes (see income tax). The governments of such nations may then finance their activity by resorting to tariffs on imported goods, since such levies are relatively easy to administer. The amount of tax revenue obtainable through tariffs, however, is always limited. If the government tries to increase its tariff income by imposing higher duty rates, this may choke off the flow of imports and so reduce tariff revenue instead of increasing it.