I'm thumbs up for this new system. The old trade system was nice for people who liked playing 'do I run out of resources in 1943 micro lotto' but for most people it was a bit of a pointless add on.
As I see it right now, your nation has a few types of resources, namely:
Manpower - used up building military units OR in factory production (I seem to remember that things like the draft have a negative impact on IC)
Industrial Capacity (civilian) - used up building more infra OR for trading for raw materials
Industrial Capacity (military) - used in building ONLY military units
Raw Materials - used for building military units OR in trading for more Industrial capacity (civilian)
Tech Teams - obvious use is obvious
All of these things (cept' tech teams) is in tension.
You could trade raw materials now for more IC right now - which you can use to build more IC or to build more Military factories. If you build more military factories, you will have less IC (since you will need to use more raw materials in house).
I do wonder, though, how this is going to affect the US - the US both had gigantic raw material reserves, but also was a fairly powerful industrialized nation.
I HoI3, I traded for as much American strategic materials pre-war as a I could, simply because there wasn't much use for money in game, other than to obtain raw materials (and the US was rich anyways). Seems like now that would be a 'bad strategy' since the US would be getting a bunch of my IC to use. Much rather get my stuff from Bolivia etc, since them having some of my IC is at least only a drain, not a drain/bonus. Ditto the Germans trading with Russia, etc. If you get a bunch of raw materials from Russia pre-war, they will get a big economic boost.
Hmmmm.... basically its a now vs later payout scheme. Very stoked.