本研究主要目的在於探討所得變異程度對於個人捐贈行為之影響，利用美國IRS 1987年到1990年之報稅資料進行迴歸分析，首先依照所得變異程度的不同將整體資料區分為高低兩組，觀察所得變異係數（CV）高低兩個族群的捐贈行為分別受到各解釋變數之影響情形。另外，再以整體資料為觀察對象，並且加入所得變異係數（CV）作為解釋變數，進一步探討CV與個人捐贈金額之間的影響程度為何。

研究結果顯示，所得變異程度較高者的捐贈價格彈性約為-2；所得變異程度較低者的捐贈價格彈性約為-1，表示各年度所得較不穩定的捐贈者，其捐贈的金額對於捐贈價格變動較敏感，而所得變異程度較高者相較於所得變異程度較低者而言，其捐贈的所得彈性較小，意即所得較不穩定的捐贈者，其捐贈金額受到所得的影響相對較小。另一方面，個人的所得變異係數對於捐贈金額有顯著負向關係，估計係數介於-0.38到-0.58之間，表示當捐贈者各年度的所得愈不穩定，則捐贈的金額愈低。

根據本研究結果，高所得變異之捐贈者對於捐贈價格的變動影響最大，因此政府於捐贈金額列舉扣抵政策的制定，應以高所得變異之捐贈者為主要對象，給予較多的租稅優惠，使刺激捐贈之效果發揮到最大。

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