The following table provides annual sales for the four largest firms in four industries in Canada. Also provided are total Canadian and total world sales for the industry. (All figures are hypothetical and are in millions of dollars.)
a. Suppose Canada does not trade internationally any of the goods produced in these industries. Compute the four-firm Canadian concentration ratio for each industry.
b. Rank the industries in order from the most concentrated to the least concentrated.
c. Now suppose goods in these industries are freely traded around the world. Are the concentration ratios from part (a) still relevant? Explain.

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Total Sales (Canada) 530 172 94 297 Total Sales (World 1368 2452 3688 2135 Firm 1 185 27 Firm 2 167 24 Firm 4 47 Firm 3 Forestry products Chemicals Women's clothing Pharmaceuticals 98 37 19