This database produces original trade- and welfare-reduction indexes developed from the trade restrictiveness index literature that James Anderson and Peter Neary pioneered during the 1990s, and by using the NRA and CTE estimates for each focus country in the core database, along with value of production and consumption at undistorted prices for each product.
The working papers wps4864 and wps4865 working papers available as external resources serve as the "methodology papers" for this extra database.