The most important number in African trade is 40.

Africa is now the world's fastest-growing vehicle market by rate of expansion — roughly 1.29 million new units sold in 2025. Yet across sub-Saharan Africa about 83% of the light vehicles reaching the road are second-hand imports, most of them shipped in used from Japan. A continent that buys cars and barely builds them. In February, in Addis Ababa, African heads of state moved to change that with the least glamorous instrument in the trade toolkit: a rule of origin.

On 14-15 February the AU assembly signed off harmonised rules of origin for vehicles and parts — customs codes 8701 to 8716 — after the AfCFTA Council of Ministers agreed the text in Cairo the previous September. The headline is that number: a vehicle or component must contain at least 40% African-originating content to qualify as 'Made in Africa' and cross the free-trade area at preferential duty. Up to 60% may still be imported. Set beside the comparators, 40% is a deliberately low bar — USMCA demands 75% regional value content for a passenger car, while ASEAN's general rule sits at 40%. The modesty is the strategy: pitch the threshold where today's fledgling assemblers can actually reach it, then ratchet it up as the supplier base thickens.

A rule of origin is not paperwork; it is industrial policy in a customs uniform. It decides who captures the value inside a bloc. A loose local-content rule lets an assembler import a knocked-down kit, bolt it together and claim the preference — jobs, but shallow ones. A demanding rule forces the components — wiring looms, seats, glass, stampings, batteries — to be made on the continent, which is where the durable employment and the technology transfer actually sit. The 40% figure is a wager that a reachable requirement will pull the first tier of suppliers into being without strangling the assemblers who are those suppliers' only customers.

Which is why the more revealing event this summer was not the signing but a classroom. From 15 June the African Association of Automotive Manufacturers, the AfCFTA Secretariat and Afreximbank ran their second Automotive Executive Short Course — a seminar week in Accra for senior officials, a six-week online assignment in which participants draft real AfCFTA-aligned automotive strategies for their own countries, and a consolidation week at South African plants in early August. The rule is continental; the capacity to use it is not. Writing a local-content schedule, sequencing it, and policing it is a specific, teachable skill, and the agencies that send people to learn it will out-execute the ones treating the rule of origin as a finished deal.

The trap is the mirror image of the prize. Rules of origin have already snagged in autos and textiles precisely because the supplier base is thin: demand 40% African content in a country that makes none of it and you have not built an industry, you have walled one off. Morocco and South Africa — which between them account for most of the continent's existing vehicle output — can clear the threshold today; a Ghana or a Nigeria starting near zero cannot, and risks watching investment route to the two incumbents the rule quietly favours. The lesson this brief drew from Morocco a fortnight ago holds: local content is built one supplier tier at a time, on a published schedule, with aftercare — not conjured by a percentage in a treaty.

Still, the direction is right and the account is moving. Intra-African trade reached $213.8 billion in 2025, up 5.5%, and Afreximbank expects around $230 billion this year; more tellingly, manufacturing and agri-food processing are projected to make up 48-50% of that trade in 2026, against 46% a year earlier. That compositional shift — from shipping raw materials out to moving finished and intermediate goods across borders — is the whole promise of the AfCFTA, and vehicles are its hardest test. Get the automotive rule of origin right and it becomes the template for everything more complex than a sack of cocoa. Get it wrong and it is a toll booth on an industry that does not exist yet.