本研究以台灣及南韓為例，探討總體經濟因素，如經濟成長率、平均國民所得年增率、人口年增率、消費者物價指數年增率、匯率變動率、失業率年增率等，對國防支出之影響。我們使用多元線性迴歸等統計方法，實證結果顯示，台灣平均國民所得年增率及消費者物價指數年增率對國防支出呈現正向影響，經濟成長率及匯率變動率對國防支出有負向影響，可能由於台灣國防支出受限於政策及社會福利等預算排擠，未能隨經濟成長而增加。南韓匯率變動率對國防支出則呈現正向影響，平均國民所得年增率及失業率年增率對國防支出有負向影響。

This study investigates the effects of macroeconomic factors, such as the rate of economic growth, the annual growth rate in per capita GNP, the annual growth rate of population, the annual growth rate of CPI, the change rate of exchange rate, and the annual growth rate of unemployment rate, on the defense expenditure by taking Taiwan and South Korea as examples. The multi-linear regression model is applied in this study. The empirical results show that both the annual growth rate in per capita GNP and the annual growth rate of CPI present positive effects on the defense expenditure, while both the rate of economic growth and the change rate of exchange rate appear negative effects on the defense expenditure in Taiwan. The reasons for the results could be that Taiwan’s defense expenditure is limited by the budget crowd-out effects from government policies and social welfare. For the part of South Korea, the change rate of exchange rate presents positive effects on the defense expenditure, while both the annual growth rate in per capita GNP and the annual growth rate of unemployment rate appear negative effects on the defense expenditure.