In Captain of Industry, how can I start leaping forward in production? I run 2xAssIII of Construction Parts 3 but it is really just a trickle in the scheme of things, when there are half a dozen things (ie Blast Furnace 2s) I need to build that cost 100s of them.
I am just about to start making Electronics II.

Should I be leaning on trade contracts, and leapfrogging up the export techtree as I go? I've not touched any of them at all, despite having some excess capacity in Cement, Vehicle Parts and just recently Food Packs. Just running 2 notches of an Oilrig out in the world, nothing else.