Tiberias of our sages, good is thy sight. Seeing means wisdom. Good means that he can be awarded wisdom there. And Rabbi Shimon Bar-Yochai was purifying the markets of Tiberias. The impurity of the dead, that is, of the will to receive, means, “the wicked, in their lives, are called ‘dead.’” And all impurities belong only to Hochma (wisdom); hence, in Tiberias, where there is the quality of Hochma, the market had to be purified.