Really? *no* credible evidence? That’s strong wording - and it’s totally wrong. I’ll list a few papers showing that claim is false. [THREAD] https://twitter.com/maxboot/status/1252758166435057664

1/Jaeger et al. 2018: the immigration literature often uses “spatial” studies to study the impact of immigration on wages. They’ll compare areas w/ high immigration to areas w/ low immigration. Problem: the most economically prosperous areas attract migrants, which will bias...

2/results and make it look like immigration has no (or even a positive) impact. To fix this issue (known as endogeneity bias), economists use an instrument. Long story short, the instrument most economists use has been shown to not be effective in fixing the problem. ...

3/Jaeger critiques the literature which uses that instrument (which is most the pro immigration literature, btw), and when you fix it you find immigration reduces wages. Link: http://www.djaeger.org/research/wp/JRS-NBER-20171201.pdf

4/There’s plenty of credible papers going back and forth on the Mariel boat lift (an event which led to tons of refugees arrive in Miami almost overnight - a good Nat. Experiment) some of which claim the event reduced wages significantly. ...

5/it’s a long debate, too long for this thread, but imo the best evidence suggests the event lowered wages. This interesting and innovative study found Mariel (and two other mass-migration events) reduced job vacancies in Miami. Link: https://www.nber.org/papers/w24580 

6/Xie (2017) looked a bit into economic history. Xie found the 1920s immigration restrictions increased black and manufacturing wages, and, interestingly, high rates of immigration reduced the adoption of manufacturing tech (why adopt tech if you have cheap workers)...

7/ https://www.iza.org/publications/dp/11214/the-effects-of-immigration-quotas-on-wages-the-great-black-migration-and-industrial-development

Ironic considering they always say we need immigrants in order to increase innovation. @MarkSKrikorian in his book on immigration also notes how immigration retards the adoption of new technical innovations [ https://www.amazon.com/dp/1595230351/ref=cm_sw_r_cp_api_i_s06NEbZR1X9YX]

8/Bound et al. (2017) found in the absence of immigration, US computer scientists’ wages in 2001 would have been 2-5% higher absent 1990s immigration, and employment 6-10% higher. Like many papers, it finds overall output rose, but it had distributional consequences — and, as ...

9/ an AF conservative, my goal is an orderly and prosperous society. Maximising GDP at all costs is not always the goal! https://www.nber.org/papers/w23153 

10/Another paper, Doran et al., takes advantage of the fact H1Bs are distributed via lottery on the day the cap is exceeded, so taking advantage of this they found firms who won the lottery reduced median wages & increased profits compared to lottery users https://gspp.berkeley.edu/assets/uploads/research/pdf/h1b.pdf

11/Finally, the NAS reviewed the literature and most estimates suggest immigration reduce wages for workers who compete with immigrants.
https://www.nap.edu/catalog/23550/the-economic-and-fiscal-consequences-of-immigration

I could add more, but this is enough.

12/To say there’s no good evidence immigrants reduce wages is false. One can disagree w/ this evidence, but it’s totally disingenuous for open borders types to act like all of the evidence supports their position. It doesn’t.