No one can really know ahead of time what the exact effect of a large policy shift will be, but something like this sounds plausible. Deport 12 million undocumented immigrants from the US en masse and you’ll see just how key they were in terms of US economic prosperity. You’re going to see a lot of those jobs go unfilled, which is going to undercut a lot of industries. A lot of agriculture is dependent on hard-working illegal immigrants and it’s hard to see how that industry would operate under Trump’s immigration plans.Of course, Trump vacillates a lot on what his plans actually are, but they’re usually something like “deport every undocumented person, build a wall to keep out new ones, and curtail legal immigration from Muslim countries”.What I find particularly funny is that the Wharton School at Pennsylvania is Donald Trump’s alma mater. So far, the Wharton School has been incredibly circumspect in commenting about its relationship with Trump (who was an undergrad there…not a member of the more prestigious MBA program).It’s very tough to know exactly what will happen if Trump’s immigration plans are accepted, but it’s hard to envisage mass deportations of 12 million people without also seeing a lot of economic pain in the process.