Chicago has a number of nicknames and “Derivatives Capital of the World” is one of them, as the city is home to CME Group and CBOE, two major U.S. exchange operators. The city risked this title in 2020 with the push for the LaSalle Street Tax, a financial transaction tax (“FTT”) that would impose a tax on trades made by Chicago exchanges. This tax was an attempt to fill the city’s billion dollar 2021 budget shortfall, but failed in large part because the evolution of trading has made these operators incredibly mobile. In a Chicago City Council meeting, Terry Duffy, CEO of CME Group, made it clear the imposition of the LaSalle Street Tax wouldn’t result in more revenue for the city, but a great deal of empty office space instead. For now, the LaSalle Street Tax is off the table in Chicago, but other governments, like New Jersey, are considering similar taxes. States considering FTTs ought to look at the pushback in Chicago and understand that mobility is the inevitable defense to such a tax.