So you are in the “wife takes care of the money” boat.
My wife has suggested it, as she claims that it’s normal here. My reply has always been shall we say clear and not leaving any doubt in her mind as to my attitude toward the issue.
As a matter of fact, every time she buys something we can’t afford, I suggest that she gives her income to me for safe keeping. I will then make sure that things are paid. She is not too happy about this, even though I think and state that I could do a better job than she does. (You want new shoes!!! You got a pair 2 years ago! You should have your head examined!)
Seriously, one intercultural problem I have encountered is that she will buy something major for the house, such as furniture etc. and not even ask me beforehand, even though we have an agreement stating that we have to agree.
When I moan about it, she then replies that if she asked me I would not agree. “Exactly my dear, that’s why we have this agreement” is my usual answer.