커피․차 소비지출과 소득의 영향에 관한 연구

The Impact of Household Income on the Coffee and Tea Drinking Expenditure: A Study Focused on Employment Type and Income Bracket

The purpose of this study is to examine the income elasticity of coffee and tea drinking expenditure using time series data from 1990 to 2011 with ordinary least square (OLS) regression model. Real gross national income (GNI) and real coffee and tea drinking expenditure data were gathered from 1990 to 2011. The results of this study show the income elasticity of coffee and tea drinking expenditure was 0.509 indicating that coffee and tea are considered necessities. The results of the income elasticity of the coffee and tea drinking expenditure by employment type and income bracket show that only employment type demonstrated influence on the coffee and tea drinking expenditure. More specifically, coffee and tea drinking expenditure of nonemployee household members was influenced by the household income change. However, employee household members were not influenced by the household income change. In addition, the result of impulse response function indicates that the coffee and tea drinking expenditure responds positively to major changes in household income which then take around nine months to recover.