We should remember not to compare incomparable values.
E.g. In the 1950's China you could have 45.000 soldiers-workers complete a dam with their shovels in 3 months. This would cost you 45.000*90 portions of food, 45000 shovels (which in turn cost 45000 sticks and some metal), perhaps some pencils for the planners, and very few other things. In Belgium this would require the salary of some hundreds technicians, oil and maintenance for the machinery, the use of highly sophisticated tools, the reward for the construction company (private sector, remember!), perhaps some gifts for the ministers, compensation for the farms-to-be-flooded, some environmental research on the consequences etc.etc....
How many million Francs would that be?
But in game matter it's only IC. So If Belgium was able to build 2000 tanks a year and it should have 20 IC, then a ComChina able to build 20.000 tanks should have 200 IC.No matter if Belgium's GDP was 20 times higher because of Kongolese diamonds or anything. Money is irrelevant.
I really like this fact, because it reminds me that in real life also, the only valuable thing is labour - not numbers.