"Ray Kroc, a high school dropout, built a business by convincing companies that sold shakes and malts (such as Walgreens) that using paper cups instead of glassware would increase their sales volume. Kroc further helped their businesses by devising a contraption that would allow them to make multiple shakes at once.
World War II and a slew of other factors caused orders for his machines to slow to a near stop. When he happened upon a couple of brothers in California selling quick lunches (and shakes!), Kroc saw an opportunity to transform the way Americans saw lunch.
Though he may have too hastily signed a contract detailing the franchising opportunity, he never relented in his pursuit of his dream, and after more than five years of quality management and trying to make ends meet (assuming enormous debt to buy out his less ambitious business partners), McDonald's started making a profit, and eventually served "billions and billions" of burgers that, at the time, far exceeded the standard fare of the day."