A regional grocery chain is debating whether to sell its house-brand snacks nationwide. Some of the chain's managers warn that the rollout would disappoint: once shoppers in unfamiliar markets encounter the house brand, sales will drop, because those shoppers strongly favor established national brands. This concern is not well founded. In the three regions where the chain already stocks the house-brand snacks, the brand's share of snack sales has climbed steadily over the past two years. Shoppers in those regions had no prior loyalty to the house brand either, yet they came to choose it regularly.
In the argument as a whole, the two portions in boldface play which of the following roles?
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