Kevin DeBuryne is an incoming freshman at your college. Kevin is frustrated by the cost of books, tuition, and expenses, and he needs to purchase a rather expensive laptop. In an effort to save money, Kevin begins a Facebook group finding other college students who need to purchase laptops. Soon, Kevin's Facebook group has close to $100,000$ students. Kevin decides to collectively approach different computer companies to see if his group qualifies for a special discount. What business strategy is Kevin using to purchase laptops?

decreasing entry barriers

collecting business intelligence

increasing buyer power

purchasing a substitute product