In their book, Freakonomics, Steven Levitt and Stephen Dubner argue that economics is, at root, the study of incentives.

American Public Media's new series, "Freakonomics," takes that argument and further explores how seemingly disparate things are actually connected.

Tune in Saturday at 4 on VPR to find out how much power the President of the United States actually has and whether movies like, "The Texas Chain Saw Massacre," influenced the decline of hitchhiking in America.