Governments intervene in trade through a toolkit of instruments — tariffs, quotas, subsidies, standards. This module covers what these instruments actually do, who bears their costs, and why the seemingly arcane concept of 'effective protection' matters enormously for African industrialisation. It also covers the political economy of why protection persists despite its costs.
The tariff and its incidence
Who pays a tariff?
A tariff is a tax on imports. For a small country (one that can't affect world prices — most developing countries), the analysis is clean: the tariff raises the domestic price by the full tariff amount, so DOMESTIC CONSUMERS bear it (they pay more), domestic producers gain (they get the higher price and produce more), the government collects tariff revenue, and there is a net deadweight loss — two triangles representing the consumption distortion (consumers buy less than optimal) and the production distortion (high-cost domestic production replaces cheap imports). The key result: a tariff makes the country as a whole worse off (the deadweight loss), with consumers losing more than producers and the government gain. The 'foreigners pay our tariffs' claim is false for a small country — your own consumers pay. (A LARGE country can improve its terms of trade with an 'optimal tariff' by forcing down the world price, gaining at foreigners' expense — but this invites retaliation and rarely applies to developing economies.)
Effective protection and tariff escalation
The protection that matters for industrialisation
The nominal tariff on a finished good understates the protection given to the activity of producing it. The effective rate of protection measures protection on the VALUE ADDED (the processing margin), accounting for tariffs on both outputs and inputs: A tariff on the output raises the value-added a domestic producer can earn; a tariff on imported inputs lowers it. So a country that tariffs finished goods but lets inputs in cheaply gives processing activities very HIGH effective protection — often far above the nominal tariff. The critical application is tariff escalation: rich-country tariff structures (and many others) impose LOW tariffs on raw materials and HIGH tariffs on processed goods. This escalation gives high effective protection to rich-country processors and PENALISES processing in commodity-producing countries — a Kenyan exporter faces low tariffs on raw coffee beans but high tariffs on roasted/branded coffee, so the incentive (and the value-added) stays abroad. Tariff escalation is a major structural reason African economies remain stuck exporting raw commodities rather than processing them (the GVC and development courses) — it is protection deliberately structured to keep value-addition in the importing country.
Quotas and the quota rent
A quota is a quantitative limit on imports. Like a tariff, it raises the domestic price (by restricting supply) and creates deadweight loss. The key difference is the quota rent: the gap between the high domestic price and the low world price, on the imported units, is a rent that goes to whoever holds the import licences (not to the government, unless the licences are auctioned). So a quota is often worse than an equivalent tariff: it forgoes the government revenue (the rent goes to private licence-holders instead), and the allocation of valuable licences is a prime source of rent-seeking and corruption (the Political Economy course — allocating import quotas is a classic rent). Quotas are also less transparent and more distorting (they cap quantity rigidly, so a demand surge spikes the domestic price). Economists generally prefer tariffs to quotas, and auctioned quotas to allocated ones, for these reasons (the sugar-quota exercise from the Political Economy course).
Non-tariff measures
As tariffs have fallen globally, non-tariff measures (NTMs) have become the binding barriers: technical standards, sanitary and phytosanitary (SPS) requirements (food-safety rules), licensing, customs procedures, and rules of origin (the preferential-trade module). NTMs can be legitimate (genuine safety/quality standards) or disguised protection (standards designed to exclude foreign competitors). They are harder to measure and negotiate than tariffs, and they hit developing-country exporters especially hard (meeting EU food-safety standards is a major barrier for African horticulture). The shift from tariffs to NTMs as the main trade barrier is one of the most important developments in trade policy, and tackling NTMs (not just tariffs) is central to the AfCFTA agenda (the facilitation module of that course).
The political economy of protection
Protection for sale (Grossman-Helpman)
If protection makes the country worse off, why is it so common? Grossman and Helpman's 'protection for sale' (1994) models trade policy as the equilibrium of a political market: organised industry lobbies offer political contributions (support) in exchange for protection, and a government that values both contributions and (some) social welfare sells protection to the organised sectors. The prediction: sectors that are organised, concentrated, and import-competing get protected; the diffuse consumers who pay do not organise to resist (the recurring collective-action asymmetry). Protection is thus an equilibrium of the political market — bought by concentrated producer interests and paid for by diffuse consumers — exactly the rent-seeking and capture logic of the Political Economy & Governance area. This is why trade liberalisation is politically hard, why protection clusters in organised industries, and why the economically correct policy (low, uniform tariffs) loses to a structure riddled with sector-specific protection sold to lobbies.
Exercise
A country produces raw cocoa and wants to develop a domestic chocolate-processing industry. Its main export market imposes a 0% tariff on raw cocoa but a 30% tariff on processed chocolate. Domestically, it is considering protecting its nascent chocolate industry with either a tariff or an import quota on foreign chocolate. (1) Explain how the export market's tariff escalation penalises the country's processing ambitions, using effective protection. (2) Analyse the welfare effects of protecting the domestic chocolate industry with a tariff — who gains and loses. (3) Compare using a quota instead, focusing on the quota rent and rent-seeking. (4) Use 'protection for sale' to predict which domestic industries will actually end up protected and why.