Wow, all those graphs and charts sure do look impressive! Too bad none of it passes the smell test -- the test of common sense.
Will adding hundreds of millions of people to our country increase GDP? Sure, but does that mean the average citizen is better off? The only thing that matters is GDP per capita and average wages -- this has been steadily going down over the last decade - a decade of high immigration. And now these clowns want to double and triple down on the influx.
Studies like this are manipulated and worked to deliver the result the creaters wanted to find in the first place. Common sense tells you that drafting low skilled, uneducated talent into a modern welfare society doesn't deliver more than it costs. General society is not bettered by having to support masses of the unassimilated while simultaneously having their wage rates reduced. No study is going to tell me otherwise.