It's really hard to do that in the general case. As the aphorism goes, "Show me your budgets and I'll show you your priorities", and in a democratic society, the priorities are supposed to be decided by the voters.

You could however envision a system where the bottom-line (the overall budget surplus or deficit) is dictated algorithmically by economic conditions, with the government free to move funds between different priorities, raise taxes, or cut overall spending as long as they met the target budget surplus. Actually wouldn't be a bad idea; it mimics how private organizations and households have to adjust their spending to fit constraints. The whole idea of algorithmic central banking and algorithmic fiscal policy could be quite interesting, particularly now that you have cryptocurrency where you can build algorithms into the nature of money itself.

Better said than I: that was the distinction I was trying to make.

What should absolutely be democratic.

Bottom line, maybe we try less so.