In All You Can Pay, Anna Bernasek and D.T. Mongan show how companies use what they know about you to determine how much you are willing to pay for certain products and services. Colleges calculate the price you pay based on the information revealed in the application almost all parents submit for federal aid. Hotels, sports events and health products and services are also using this strategy. The price of everything online-from airline tickets to toilet paper-now fluctuates from moment to moment. Through a toxic combination of price discrimination and cutting-edge technology, sellers can instantly change the price they charge an individual based on their calculations of demand and supply at that point in time. Online stores use your zip code to charge you a different price from someone in another zip code. Bernasek and Mongan offer a dire warning and demonstrate how big data threatens the very icon of the American way: the free market. The ability to understand consumers on a granular level, in real time, and simultaneously to customize the price each person is offered, shifts the balance of power away from the consumer so dramatically that the freedom of markets is at risk. The trend is alarming and, if left unchecked, the destination is clear.