Promotion @ work

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I remember back then when I was in paid employment. In my first job I worked for about 2 years and a few months before getting a promotion, my second promotion in another job took me about 4 years but believe me it was worth the time as I was really well prepared for the post when the promotion came. there is this acquaintance of mine who has been on the same post for over six years now and never got a promotion and when he gets a raise it has never been anything significant considering the rate at which costs are risng, now he has become so demotivated that he does not value the job again, he complains so much and the worst of his complaint is that he feels he is under utilized in his present post .Tell me what can he do to make a change, do you think he should switch jobs ?