Final answer:
Harris Woodard's ability to attract enough customers for his Like New Windshields franchise is most hindered by high competition, given the market shares of existing companies.
Step-by-step explanation:
Harris Woodard's goal to have enough customers without exceeding his capacity to handle them efficiently would be most challenged by high competition in the market. Given that Smooth as Glass Repair Company holds 16% of the market and Your Car Shield Company, along with several other smaller companies, holds a combined total of 42% of the market, Harris's new franchise Like New Windshields must contend with multiple competitors. This high competition can make it difficult for him to attract and maintain a consistent customer base, especially when the top four firms have a combined market share of 40%, which is less than half the market, indicating room for competition.