Is AI a bubble? It's the trillion-dollar question in the economy. So Marketplace’s Meghan McCarty Carino decided to look to history for some answers in this week’s special episode of “Tech Bytes: Week in Review.” McCarty Carino spoke with David A. Kirsch, a historian and management professor at the University of Maryland. He’s also co-author of the book "Bubbles and Crashes: The Boom and Bust of Technological Innovation." He and Brent Goldfarb looked at patterns over 150 years of technological breakthroughs, from broadcast radio to rayon and came up with a model of the conditions that most often lead to bubbles.