A couple of years ago I was deeply impacted by a chapter called "Stage one Thinking" in Dr. Sowell's book "The Thomas Sowell Reader." In it he talked about how intellectuals and especially liberals constantly put forth ideas for social engineering but never stop to consider the unintended consequences.....thus stage one thinking. Recently, the Heritage Foundation set the cost of Rubio's immigration bill at 6.3 trillion dollars. While politicians taut the need for illegal immigrants to " do the work that American want" they never speak to what those immigrants will cost the tax payer in welfare, medical care, education, and incarceration. The difference is a net deficit for the tax payer.