The conditional is used for politeness; in that case an 'if' clause is usually understood but not uttered. In the above case: Well, then, I think it would be good f or you [if you are willing to / if you want to /if it is convenient] to call that store ... By using the conditional II , the speaker demonstrates that the action depends on the listener's opinion/decison, not the speaker's opinion, and is thus more polite.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.