Down with price tags! Here's how to profit when people pay what they want.

Last week saw the end of an ambitious experiment: Panera Bread's pay-what-you-want turkey chili, which the sandwich chain started offering at 48 St. Louis-area stores to raise awareness of food insecurity and offer meals to the needy. Customers could pay the $5.89 "suggested" price, or more or less, or nothing. After an initial burst of interest in March, company executives said that customers just stopped realizing the option existed, and they pulled the option for "retooling."