If you are married or live with a partner, how do you handle your finances?

I’m not looking for details, just general arrangements. My Ex and i pooled most of our money and all expenses were paid from a joint account. We each had a little mad money of our own. I know other couples who keep their money separate and divide up who pays for what.

Just curious about how others do it. It’s an academic question for me at this point but I was surprised when a friend said he couldn’t afford the money for a trip with his partner when I know his partner makes a good living.