Lexicus
Deity
Ok so you go banking, replaceable parts, rifles, then probably economics after. It's rare to sit on banking very long without teching economics. If you beeline rifles and ignore education then I suppose you could run it a long time. Still not that great though as foreign trade is probably worth as much.
I virtually never self-tech economics, and I usually backfill banking after having gotten liberalism. YMMV i guess.