They carried on a well organized system of commerce in which they exchanged articles with other tribes. In this manner they obtained from the Mo-nos around Mo-no Lake obsidian for use in making arrowheads,
salt for domestic use, the larvae of beetles which were considered a great dainty and which were only found on the shores of Mo-no Lake, and other goods which were not to be found in the Valley; giving in exchange articles of food, skins, robes, and shells. The latter were obtained in exchange from Indians on the plains to the west and used as money by the mountain tribes.