Jourin has a point - but I also adapt my production with my income. I've (almost) learned to balance the expenses with the production (I'm sucha nerd).
I also build lots of storage. But I'd rather build good extraction/miner facillities on a planet with a high value.
Sometimes economy takes a really bad trip. It usually happens when you haven't stopped playing for eight hours or so

you forget to watch your budget. My entire storage is gone in one or two turns.
Now, that's what I call production capacity.
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Oh, and one more thing: If you play infinite resources (which is VERY interesting/nerdy), you would HAVE TO build storage facillities and Value Improvment Plants (VIP). You'd also be ready to scrap some miner facillities before the value reaches ZERO (or as high as possible), otherwise the VIPs have nothing to improve (3% of 0 is 0). But I think I found something of a bug when using these facillities in an Infinite Resource game. The value seems to be increasing sometimes, and other times it is just going down (?).
[This message has been edited by Lucanos (edited 21 March 2001).]