The persistence of industry, firm‐specific, and corporate‐parent effects on firm profitability in the food economy are calculated and further analyzed within its four major sectors: food processing, wholesale grocery, retail supermarket, and restaurant. Profits are more persistent within an industry than within a corporation. The retail supermarket sector has had stable profits as has individual retail supermarket firms relative to the other three sectors.
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Schumacher et al. (2005) studied this question.
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