The economic upgrade paths are subject to a lot of debate and personal preference. I consider my path to be the most efficient, getting pantry 1 production 2 everywhere means that you have a good amount of command points and make a good amount of money. You also save a lot of money, although it does slow you down early game. The reason for this is going production 1 pantry 2 costs 750, and going pantry 1 production 2 only costs 600. You don't need 1800 command points early on in the game, but if you do this upgrade method everywhere you will get 1800 once you have map control.