Multi-site businesses can choose to report on a per-site basis (and it sounds like many businesses actually do this) or on an overall basis and the analysis inc

Multi-site businesses can choose to report on a per-site basis (and it sounds like many businesses actually do this) or on an overall basis and the analysis includes those that report on a per site basis. So it may or may not include those particular businesses. In addition: "we exclude observations with calculated wages below $9 or above $500 in 2015 dollars. We also exclude observations reporting under 10 or over 1,000 hours worked in a calendar quarter. These restrictions exclude 6.7% of all job/quarter observations." Overall, as others mentioned in this thread already, they included 89.2% of firms and 62.1% of employees. They mention survey data that suggests that the businesses they exclude are more likely to reduce jobs in Seattle than the ones that they include. From the study via non-paywalled link posted by andrewla below: https://evans.uw.edu/sites/default/files/NBER%20Working%20Paper.pdf https://evans.uw.edu/sites/default/files/NBER%20Working%20Pa...