Did you know since 2008, DBS Group (SGX:D05) already bought five different banks? That’s once every three years. It’s not often DBS buys a bank. But when it does, it goes in big. Why do I tell you this? Because this is how banks grow. Banks grow by buying other financial firms. You see, deposits are “sticky” businesses. You don’t see people take all their money to put in another bank just because of higher deposit rates, right? That’s why it’s hard for banks to grow organically. DBS recently announced it’s buying out Citigroup’s Taiwan business. DBS will pay in cash for Citi Taiwan’s net assets plus another S$950 million in cash as a premium. That’s a 1.8x P/B multiple for the deal. I find this an expensive price tag DBS is paying versus the other deal. But this… DBS deal has a far larger potential  I’ll explain.  ...