Basquiat paintings regularly fetch tens of millions of dollars, and the recent sale of a little-known Da Vinci topped $450 million. But what are the forces that drive this white-hot art market? With unprecedented access to in-demand artists like Jeff Koons, Gerhard Richter, and Njideka Akunyili Crosby, and to prominent collectors and dealers, Academy Award–nominee Nathaniel Kahn coaxes out the dynamics at play in pricing the priceless, holding up a mirror to our values and our times—where everything can be bought and sold.