A novel way to maintain strong friendships? Creating a joint bank account. That's the advice Madison Machen received last year while chatting with her seat-mate on a flight to New York. The woman was on her way to meet her best friend on one of their periodic trips. The trip, she told Machen, was funded by her joint account with the friend. "I loved the concept so much, I went home and I called my best friend and I was like, I think we need to do this," Machen said.

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