I've been down that road, in 2 totally different ways.
1) Its why the courts give 75% of "hidden assets" to the spouse they were hidden from, not just half. When one spouse is hiding assets from the other spouse its SERIOUSLY no bueno. My ex was hiding how much he MADE from me, for years. Here I was living on a shoestring budget, meanwhile he was stashing (and spending) thousands. Insert derrogatory invective here.
2) Is 180 degrees different from the above. We EACH had $200 a month "allowance". $100 per paycheck for ALL personal expenses (subscriptions, work lunches, clothes, haircuts, hobbies, etc.). Well, he blew through his every month & had "nothing" left. I save half of mine each month, and after 2 years had saved up enough for a $2000 laptop. He was FURIOUS with me... And demanded we spend my savings on something else. Um. No. (Hail No / How DARE he...after finding out he was hiding 10s of thousands). Our personal spending money was OURS. To spend as we chose with absolutely no oversight (as opposed to family money). He had spent his, I was spending mine. Just slower. It was equal/fair as long as we both had the same. Same amount. Same rules. Not "I get to spend $200 a month, but you can only spend $100. Unless you spend it fast. Then $200 is fine. Um. No. Same amount. Same rules.
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So, to ME, it depends on whether he's hiding assets / or is saving his personal money.