so we use the number of employees obtained from the National Establishment Time-
we use the annual unemployment
rate of the county in which a facility is located from the U.S. Bureau of Labor Statistics [35].
3.2 Instrumental variables
We apply two time-varying instrumental variables (IVs) based on findings from the previous
literature. They are the lagged proportion of facilities that have adopted P2 techniques in the
same industry (defined by the 2-digit SIC codes)
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