“Shared interest(s)” vs “common interest(s)” - for native English speakers. EDIT: perhaps this seems like a slightly odd question, but in Danish I would never say “shared interest(s)”, but only “common interest(s)”, so to me it’s a little strange that in English I also encounter “shared interests”. I have two questions: 1. I assume that “shared” and “common” are interchangeable in the following sentences. Is that correct?: How important are common interests in a relationship? How important are shared interests in a relationship? 2. When “interest” is used with the meaning “an advantage or benefit of a person or group” I suppose you would normally say for instance: “It is in the common interest of all citizens that...” and not so often “It is in the shared interest of all citizens that...” Is that correct? Perhaps it’s not really a difference in meaning, but simply a matter of collocation? Thanks for your help!