Even though this article is about the U.S. there is a clear parallel with the Canadian food industry.

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    57 months ago

    Economists have a metric known as the “four-firm concentration ratio,” sometimes deployed in shorthand as “CR4.” It is a measure of competitiveness in a market for goods or services. When four companies gain a combined market share that is greater than 40 percent, an oligopoly has formed.

    TIL https://en.wikipedia.org/wiki/Concentration_ratio