*If* mass deportation happened, there are some obvious effects:
-Construction costs increase dramatically almost everywhere in the US.
-Housing values/rents at the low end collapse in many areas as lots of people move out.
-Food prices rise dramatically, especially for prepared foods.
-Lots of domestically grown produce (and some meat like chicken that requires manual processing) becomes extremely expensive/uncompetitive with Mexican/Central American/Chilean imports.
-Jobs at the very low end pay a lot more, prices for services like housekeeping, landscaping, etc rise dramatically.
I guess the obvious immediate effect would be a lot of inflation (for basic goods and services), combined with total collapse of housing markets (both purchase and rental prices) at the low end in some places. The obvious winners would be low-skill unemployed people who can keep their act together enough to hold down a job/work hard - they'd make more money and also have cheaper housing available. Everyone else probably loses in one way or another.
-W