Supposed you are in a long-distance relationship for some years, of course you want to be with your partner in a same city, but both of you have job in different cities, your partner shows reluctance to move to your city. What will you do? Sacrifice your job to move to another city? Is it worthy to do so? Then you need do a decision tree analysis! If you move to another city, you need to quit your old job and find a new one, probably you can’t find a new job immediately, there may be a period that you have no income. Let’s assume you need a year to find a new job. Then the costs of moving will be the benefits of your original annual income. For your relationship, you know if you move to your partner’s city, there will be high chance of probability that both you will get married. If you don’t move, there will only be low chance of probability that you will get married. If you get married, your tax level will be lower, you share the rent and perhaps your annual income will be hig