折扣效用（Discounted Utility）模型乃是考慮到時間因子對人類決策行為產生之影響，並基於一些嚴謹的邏輯推理公理（Axioms）所發展出來的模型。其說明了在包含時間因素之考量下，只要遵守理性假設之公理，便可由此模型推導出人類的跨期決策行為。目前對於折扣效用模型之研究，是以指數（Exponential）型態，或雙曲線（Hyperbolic）型態為主，此兩種基礎模型似乎未能充分解釋人類之跨期決策，而對於一些異常現象的存在，即使後續之研究做了一些修正，仍有未盡完善之處。本研究擬導入冪次型（Power Law）函數作為折扣函數之另一選擇，蓋與指數型函數相比，冪次型函數較無下降曲率過大之缺點，而與雙曲線型函數相比，冪次型函數則較具有彈性。本研究以理論推導方式，驗證冪次型折扣效用模型之存在，再以實証研究方式，對以上三種模型做比較。

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