It is a very complicated product. Whole countries like Russia and China are trying to build even somewhat smaller modern jets and basically haven't been able so

It is a very complicated product. Whole countries like Russia and China are trying to build even somewhat smaller modern jets and basically haven't been able so far. And for "national jet" the task is easy as you can allow some inefficiencies. For a pure commercial jet product like EMBRAER would supposedly build, it must be a topline on all KPIs otherwise some ROI numbers over 10-20 years would project it to be several percent worse than Boeing/Airbus, and the airlines wouldn't buy it.