The economic importance of the three performance traits, average daily gain, feed efficiency and backfat thickness in determining the sale price of performance tested boars was evaluated on the basis of the data from the Korea Boar Testing Station. A total of 54 Duroc, 57 Yorkshire and 36 Landrace boars met qualifying requirements and were sold at the public auctions held each month from July, 1984 to December, 1984. The phenotypic correlations of sale price with average daily gain, feed efficiency and backfat thickness were 0.50, -0.40 and -0.34 in the Duroc, 0.53, -0.29 and -0.39 in the Yorkshire and 0.59, -0.28 and -0.35 in the Landrace. The coefficient of determination in the multiple regression analysis of sale price using the three performance traits as independent variables was 0.51 in the Duroc, 0.48 in the Yorkshire and 0.47 in the Landrace.