SC4's economic model?

[biguc]

What do you guys know about it?

Lately, I've been tinkering with fiscal policy in my cities in order to boost growth. Has anyone else tried this before, and noticed an effect? I usually end up running really large surpluses and then have millions of dollars sitting around, sucked out of the economy. Presumably my economy would do better with that money in it, rather than stored up by my government. Then again, does the game model investment of savings? If so, then I don't have much to worry about. On the other hand, if I gutted my taxes and ran a deficit to burn up my savings, would that spur growth, erasing the deficit?

I'm curious how realistic you guys think it is.