They thought re-engining the 737 would cost 2bn and a new plane would cost 10bn for a savings of 8bn. The actual development cost for the MAX was 4bn so their

They thought re-engining the 737 would cost 2bn and a new plane would cost 10bn for a savings of 8bn. The actual development cost for the MAX was 4bn so their estimates were off by a factor of two. Naively the MAX saved Boeing 16bn (20bn - 4bn) in development costs. They saved “double” (by failing upwards) on development and it only cost them the future of the company.