It’s hard/impossible to say “this number should be equal to X” and that’s healthy.
Going through the MER and studying trends can help define “healthy” relationships and boundaries.
Production outpacing Destruction, may be because of stockpiling of expensive ships but fighting with cheap ships.
We should also strive for a healthy distribution of activities, Looting vs Bounty vs Mining and their geographical locations.
A strong economy is built on solid foundations, previously we mostly had bounty and ore mining, but now PI and Gas play a bigger part. Its the same with Fishing/Tourism real world analogies. Bounties are no longer dominant compared to Looting (in ISK market value) and this needs to be balanced carefully. but also from a “per character” perspective.
Diversity is key, resource, activity, ships flown. Everytime an economy starts relying to heavily on one thing, it is at risk of breaking down.