When the Soo Line threatened to expand into the Great Northern Railway’s territory in 1905, the two companies entered a fierce competition for marketshare in which the they rapidly constructed nearly 500 miles of rail tracks and over 50 new towns. In this episode of The Pie, Chad Syverson, the George C. Tiao Distinguished Service Professor of Economics at the Booth School of Business, explores this unique historical episode, shedding light on how acts of strategic competition, past and present, can affect our social welfare.