re: How do you baws split expenses with the wife?

Our money has always been in one general spending account and a couple others that were future education savings for the kids and retirement planning.
There has never been an issue with money. She wants something, she can go get it, same with me. We have always discussed big purchases in advance so there were no big surprises.
I also understand the reasons for split accounts and if that works for you, then that's great too.