From Quartz - The ROI on border walls is terrible, the following claim was made::
Low-skill workers earn one cent in extra income for every 19 cents the government spends on walling off Mexico
It further claims that every other demographic ends up financially worse off with the wall being built.
Unfortunately the actual study is pay-walled so I can't analyze it in detail. Are these claims accurate, and does the study have sufficient evidence of the claim to be considered a trustworthy source for policy decisions?