Indirectness is costly and risky . It is costly in the sense that an indirect utterance takes longer for the speaker to produce and longer for the hearer to process/understand/interpret. It is risky in the sense that the hearer may not understand what the speaker is getting at.
An American woman was visiting Israel. One evening a woman went to the flat of some friends and her host asked her what she would like to drink. She replied, ' Well, I've been on whisky all day .'
Social distance is a composite of psychologically real factors (status, age, sex, degree of intimacy) which together determine the overall degree of respectfulness within a given speech situation. (Leech, 1938)
In an unequal power relationship [e.g. between students and their teacher in the case of p.129 Aeginitou (1995)], there remains a quite close relationship to one another