I was considering recently how small countries could advance their production without having to resort to years of factory-building or negotiating with Great Powers to pour in massive amounts of IP. Here is the thought I came up with...
Each factory starts in 1920 (or the starting year... whatever) building 1,000 tons per quarter. The next year, Y+1, that production goes up by 25 tons: say it's the local foreman getting better training, or the factory getting better equipment, or the workers being more productive or such. In Y+2, it jumps another 25 tons per quarter, so the factory now makes 1,050 tons per quarter in Y+2.
By 1935 (or Y+15), a country with one factory can make 1375 tons per year instead of only 1,000. By 1950 (Y+30), it can manufacture 1,750 tons - not quite enough to bump it to the next level, but still a substantial improvement overall.
Now, to offset this, we might want to make factories more expensive... say, 10 IP in the 1920s, 12 IP in the 30s, 14 IP in the 40s, and so on.
Please note that I am not necessarily suggesting this rule for us now, since we've already run the game this long with the standard rules. I'm mainly interested in what folks think of the idea, or trying to provoke better ideas in this vein. Comments?