Guys, sorry, I had to delete some posts. Let's try to keep it a bit more friendly even if we do not agree on most points. And let us not insult people who are not present here either. Personally I have a great respect for the OpenGen team, especially Luis who was the driving force behind the project for many years.
To answer oldguy's question, yes, we considered that, but did not go this way for the same reasons mentioned above. It is already hard enough to keep in mind the prices of the units (after all we have something like 700), so if they change in the course of the game, would be quite hard to keep them in mind and plan. People would complain like "I bought 10 Tigers for 1000, and in the next scen they are already much cheaper, if I only knew, etc." In the main campaign the scenarios are pretty sparce in time, so it would very much likely happen. In DLCs, where we have ~10 scens per year, it would be less of a problem though.
Also, this would not be perfectly historical. I remember some epic threads on JP's Panzers where it was shown that Germany's production actually increased a lot by the time the war entered hard phase for them. They finally converted their economy into war mode, and Speer proved to be a great manager too.