Do you have a link, for this NBER stuff ?
It might work for me.
Anyway, when presented with a gish gallop of info, one can either ignore it, or what I do, pick one claim and fact check it. I picked this one, because it is a standout claim.
"Bulgaria, a country I know well, joined the EU 1 January 2007. Before that, poverty was 1 in 5. Today, it’s 1 in 3."
Now, where I am, poverty data can be considered a "sensitive" subject, It can also be further complicated by some reports being by age demographic and what rates are used.
This site uses world bank data and $1.90 PP per day. An impressive drop from 2006 onwards, a bit of a climb from 2009... blah bah.. contradicts the above claim.
Bulgaria Poverty rate, 1974-2024 - knoema.com (opendataforafrica.org)
This site, no idea what the data source is, uses $5.50 PP per day. Again, a fair drop post 2006, the graph pretty much matching the above graph.
Bulgaria Poverty Rate | Historical Data | Chart | 1989-2022 (macrotrends.net)
2000 - 35.8%
2003 -37.3%
2006 -33.5%
2007 - 18.5%
2008 - 13.4%
2014 -13.2%
2022 - 5.5%
Of course, it's probably a coincidence that poverty dropped around 2006 , causation and correlation and all that, but it does make me wonder if the claim made by @GlobeTrotter2000 is correct.
I suspect they used specific demographic info. Poverty for ages 18-24 for example, that appears a bit higher.
Of course, for this claim " "Bulgaria, a country I know well, joined the EU 1 January 2007. Before that, poverty was 1 in 5. Today, it’s 1 in 3.", maybe Globetrotter did go out and asked all 6million people in Bulgaria individually ?