The aim of this study is to analyze the relationship between international oil price as a fuel cost in overseas fisheries and skipjack tuna price as a part of main products in overseas fisheries using monthly time series data from 2008 to 2017. The study also tried to analyze the change of fishing profits by fuel cost. For a time series analysis, this study conducted both the unit-root test for stability of data and the Johansen cointegration test for long-term equilibrium relations among variables. In addition, it used not only the Granger causality test to examine interactions among variables, but also the Vector Auto Regressive (VAR) model to estimate statistical impacts among variables used in the model. Results of this study are as follows. First, each data on variables was not found to be stationary from the ADF unit-root test and long-term equilibrium relations among variables were not found from a Johansen cointegration test. Second, the Granger causality test showed that the international oil prices would directly cause changes in skipjack tuna prices. Third, the VAR model indicated that the posterior t-2 period change of international oil price would have an statistically significant effect on changes of skipjack tuna prices. Finally, fishing profits from skipjack would be decreased by 0.06% if the fuel cost increases by 1%.

This paper investigates the impact of oil price shock on three domestic price indices such as import price index(IPI), producer price index(PPI) and consumer price index(CPI). According to the results of estimated 5-variable VAR model which utilized monthly data from 2000.1 to 2014.7, international oil price does Granger-cause IPI and PPI, but the lags of oil price do not enter into the equation for CPI. The accumulated impulse response analysis shows that the responses of one standard deviation shock of oil price result in 1.435%, 0.319% and 0.107% increases in import, producer and consumer price index after three years, respectively. The results of variance decomposition indicate that the influence of oil price to producer price index is much bigger than the import and consumer price indices.