几乎没个人都来参加庆祝迁居的聚会。
为了最大化整个生命周期的效用，家庭通常需要权衡迁居的交易成本和不迁居的效用损失。
To maximize the whole utility in life cycle, households need to weigh moving costs and loss of utility caused by unmoving.
这些传说是很有用的，因为它们能告诉我们以往人们迁居的情况。但是；没有人能把他们当时做的事情记载下来。
These legends are useful because they can tell us something about migrations of people who lived long ago, but none could write down what they did.
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