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This paper examines whether or not export insurance has promoted Japan's export supply. Japan has been the heaviest user of the export insurance system. Prior to empirical analysis, unit-root test was conducted to understand the safety of Time Series. The results show that all variables are not I(0) Time Series. Instead, they are I(1) Time Series. To this, cointegration verification was conducted based on the use of Johansen verification method to define the existence (or non-existence) of long-term balance relationship among variables. The concerned variables are revealed to be cointegrated. In order to analyze, this study introduce a VEC model. The empirical evidences show that export insurance system has not contributed to promoting export supply in Japan.