When a person marry, the property treatment is depends on each countries. It could be separated, joint ownership or selectable. It is joint owner system in Japan.

Okozukai system (pocket money) is developed based on these cultural back ground. It is budget system. Receive cash every month and the person controls expense not to over the amount. This is common in a company, but maybe there not many culture where actualize this. Of course, Okozukai govern when the person is a child but after marriage, too. And this is common domestic money control in Japan. So many people suffer for money before the payment day. Because to get extra budget, you must to convince another owner (wife). However, this is not bad way to save money.