Where there is a social issue, there is an engineer with analysis and a clever system to "fix" it.
Budgeting is one thing. But developing a fairness system... are you sure you should be married to this person in the first place? Might want to go and tweak that algorithm a bit.
In all seriousness, systems like this are brittle and really only work if you're on the same page anyway. In which case, you don't need the system. If your SO likes to spend, he or she may not agree that the "fun money" allocation is enough. You may think it's too much. So you come up with some middle ground. Resentment builds over time because your SO can't always afford the things they want, and you resent having too much allocated to his/her pile of fun money.
tl;dr: if you're not on the same page financially, a fancy system won't save your marriage. Fancy systems and over-analysis can also bring problems, YMMV.
I also find all this clerical nonsense funny. If your SO and you are not on the same page regarding goals and what both are willing to prioritize or sacrifice to achieve them, then it’s all moot.
Budgeting is one thing. But developing a fairness system... are you sure you should be married to this person in the first place? Might want to go and tweak that algorithm a bit.
In all seriousness, systems like this are brittle and really only work if you're on the same page anyway. In which case, you don't need the system. If your SO likes to spend, he or she may not agree that the "fun money" allocation is enough. You may think it's too much. So you come up with some middle ground. Resentment builds over time because your SO can't always afford the things they want, and you resent having too much allocated to his/her pile of fun money.
tl;dr: if you're not on the same page financially, a fancy system won't save your marriage. Fancy systems and over-analysis can also bring problems, YMMV.