If the DACA is repealed, roughly 645,000 people would lose their legal right to work in the U.S., putting them at risk of losing their jobs and possibly being deported, according to the San Francisco-based Immigrant Legal Resource Center. Terminating all of these workers and possibly finding and retraining replacements for them would cost businesses an estimated $3.4 billion, the nonprofit immigrant rights advocacy group estimated.
http://money.cnn.com/2016/12/20/news/economy/immigration-daca-cost-trump/