Prices, costs, and profits in Canadian manufacturing: the influence of tariffs and concentration. A model for analyzing the influence of import tariffs and domestic concentration is presented and used to derive hypotheses concerning the influence of Canadian tariffs and concentration on the price, costs, and profits of domestic import-competing industries. The hypotheses are tested using data on the relative prices, direct costs per unit, and gross profit per unit for a sample of corresponding Canadian and us manufacturing industries. The tests support hypotheses that the influences of tariffs and concentration on prices and on costs are interdependent. The interdependence is such that prices and costs tend to be high when both tariffs and concentration are high, but exhibit no such tendency when tariffs or concentration or both are low. The tests further suggest that concentration has an independent upward influence on profit per unit, but that tariffs have little or no influence on profit per unit. [ABSTRACT FROM AUTHOR]