Can you write some spending examples, because I don't really understand how it all goes together. I also can't get my head around the US which economic numbers seem strange. Can we also get a growth figure back?
Be glad to. US' economic numbers should seem very strange while the country is in civil war.
Let's take an example. First I will illustrate a case and go over explicitly what the interactions are, and then I will give an example of orders.Assume two nations:
Japan
EP: 100
IC: 5 Pub/20 Prv
BC: 5 EP
USA
EP: 200
IC: 30 Pub/100 Prv
BC: 1 EP
Japan and the USA are in a trade group together, meaning they can buy the other's IC freely.
Japan wants to build 1 Modern Armor Division. It costs 10 IC. So, Japan will need to get 10 IC. The cost of Japan's IC is equal to its Base Cost, which is 5 EP.
Japan NEEDS: 10 IC
Japan buys 5 Public IC from itself at 5 EP/IC. (-25 EP, +5 IC) {5 IC needed}
Japan buys 5 Private IC from itself. (-25 EP, +5 IC) {0 IC needed}
Total Cost: 50 EP, 1 Reserve Division, 5 Public IC, 5 Private IC
Yield: 1 Modern Armor Division, 10-IC usage boost to Japan
If Japan wanted a cheaper Modern Armor Division, it could import America's Private IC. Let's look at that:
Japan NEEDS: 10 IC
Japan buys 10 Private IC from the USA at 1 EP/IC. (-10 EP, +10 IC) {0 IC needeD}
Total Cost: 10 EP, 1 Reserve Division, 10 of the USA's Private IC
Yield: 1 Modern Armor Division, 10-IC usage boost to USA
Now since America's IC has been ordered by Japan, there is demand for America's IC, meaning some of that IC may go somewhere else. As it happens, America wants to build 13 Modern Armor Divisions.
America NEEDS: 130 IC
USA buys 30 Public IC from itself at 1 EP/IC. (-30 EP, +30 IC) {100 IC needed}
USA buys 100 Private IC from itself. (-100 EP, +100 IC) {0 IC needed}
Total Cost: 130 EP, 30 of Public IC, 100 of Private IC
Yield: 13 Modern Armor Divisions, 130-IC usage boost to USA
Now there is more demand than America's IC pool can supply. So the conflict is resolved (by us; don't worry about handling this) based on the relative economic power of those contesting. So we take the total Supply minus the Demand and find the Conflicted Amount. Share of the conflicted amount (which is negative) is based on the inverse ratio of your EP to the total EP of all contesting the resource. Since Japan has 100 EP to America's 200, its share of the conflicted amount is equal to 2 times that of America's. Japan gets -6 IC, and the USA gets -3 IC. This leaves 1 IC that is "split" between them, and will go to the highest EP in the group. Hence Japan still needs 6 IC at this point, and America needs 2.
Automatically, when this situation occurs, we will get you your cheapest IC based on the policy you executed. Either you can choose to automatically import the cheapest IC, or you can choose to fall-back on your own IC. Note that if you are in a case where your own IC is completely used-up, you will automatically start importing until you no longer need to supply those goods.
So, some acceptable order sets, for the above scenario, might be:
Japan Orders
A. Buy 1 Modern Armor Division using IC from the Americans. If that doesn't work, use our native industry.
B. Buy 1 Modern Armor Division using USA's IC: 10 EP.
C. Buy 1 Modern Armor Division using the cheapest IC on the market.
D. Buy 1 Modern Armor Division using domestic IC.
E. Buy 1 Modern Armor Division using domestic IC for 50 EP.
F. Buy 1 Modern Armor Divisions using 8 domestic Public IC and 1 Private IC from the Americans and 1 Public IC that Poland is letting me use.
G. Buy 1 Modern Armor Division (by default, will use domestic).