If you allow Sanctuary Cities, then Illegal Aliens will always under bid but then, have so little money to work with to perform the construction contract.
Hence, these Illegal Aliens will use shoddy materials and use cheap and sometimes dangerous short cuts that has to be redone.
Meanwhile, Young Black Males will be still be standing on street corners with no jobs.
the most expensive isn't always the best,
but the cheapest is almost always the worst