Problem
GameStop Racks Up the Points No retailer has more cachet among gamers than GameStop. For now, only Walmart has a larger share-21.3% last year. GameStop's share was 21.1% last year, and may well overtake Walmart this year. But if new women gamers prefer shopping at Target to GameStop, Walmart and Target might erode GameStop's market share.
Estimate a range for the four-firm concentration ratio and the HHI for the game market based on the data provided in this news clip.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.