P.F. Chang’s China Bistro, one of the most popular casual dining chains in the United States, opened its first Canadian restaurant in an upscale Toronto mall this summer, at least two years after its international debuts in Mexico and Kuwait.

Business is already exceeding expectations, the chain says, raising the question of why it waited so long to enter a neighboring market that would seem a natural fit. After all, many border-hopping Canadians are familiar with the brand.

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