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本稿では, 行動と成果の確率的関係について不確実性があるプリンシパルーエージェント関係を考え, 最適契約を特徴付ける.

The non-efficiency of the government hospital is pointed out. Then, I compare the management in government hospitals and non-government hospitals, and show clearly what kind of difference there is. In this paper, the following things are clear. (1) Clarify the difference from a viewpoint of management in government hospitals and non-government hospitals. (2) Classify government hospitals into two kinds (cites・towns・and villages-hospitals and prefectural hospitals), and clarify the difference from a viewpoint of management. (3) Classify non-government hospitals into eight kind hospitals, and clarify the feature in management.

There is a risk of longevity i.e., the self-funds after retirement may deplete before the end of life. What is needed after retirement is to spend out of self-funds in addition to public pensions while investing self-funds over lifetime without depleting. We analyze a safe withdrawal rate based on varying self-funded amounts every month due to fluctuation in the market. According to this method, there is no longevity risk that self-funds are depleted throughout lifetime.