What’s the benefit to a manufacturer to allow another brand to rebadge a car? ie: what did Ford gain from the Mazda B series?
Ford got 1st the Mazda B1800 pickup, giving them a compact pickup - Courier - while they decide if the market was real or not and then something to sell while they developed the Ranger. Followed by a good manual transmission - M5OD which they put 100s of thousands into Rangers, Explorers, Bronco II, Aerostar (the R1), T-Birds, Cougars, F-150, Econoline & Bronco (R2). Finally, the 2.3 Duratec - which is really the Mazda L for Ranger and some others.
Mazda got a midsized pickup to replace the B2200 without having to develop a whole new vehicle, just a couple body panels, a grill and some interior bits and pieces.
Probably one of the best collaborations - both sides made out well from it.