The positive effects that would likely result from the new competition include:
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better prices: The presence of a competing store may drive down prices as businesses compete for customers.
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higher quality: To remain competitive, Brianna’s Bikes may improve their product offerings and services, leading to higher quality options for consumers.
These are the likely positive effects stemming from the new competition. "Fewer choices" and "higher wages" do not directly result from the competition in this context.