evidence: The COVID-19 pandemic is, among other things, a massive experiment in telecommuting. Up to half of American workers are currently working from home, more than double the fraction who worked from home (at least occasionally) in 2017-18. [...] Just under one-third of all workers over the age of 15 say they can work from home, according to Bureau of Labor Statistics estimates from the 2017-18 American Time Use Survey. Many of those who worked from home did not have an official work-from-home arrangement but were instead taking work home with them (such as at night or over the weekend). Only 20% said they were occasionally paid to work from home, and just 12% worked from home at least one full day per month. [...] Overall, these numbers suggest that about half of employed adults are currently working from home, though a recent paper estimates that only a third of jobs can be done entirely from home. Either way, this is a massive shift. Between 2005 and 2015, the fraction of workers who regularly worked from home increased by only about 2 to 3 percentage points, according to Mas and Pallais (2020). Even at that growth rate, telecommuting has been the fastest-growing method of commuting over the last several years. If our new telecommuting culture sticks, the pandemic will have accelerated this trend dramatically. Already, nearly one in five chief financial officers surveyed last week said they planned to keep at least 20% of their workforce working remotely to cut costs.