Do we really know the extent of the problem? A. We know it is very serious. and has a severe negative impact on employment in this country. We dont know the magnitude of the problem. and we need more data. For example. estimates of the number of illegal immigrants range from 4 million to 12 million. Few students of the problem believe the number is as high as 12 million. But even if it is "only" 4 million. that is about 4 percent of our work force. which means it is a massive problem even based on the lowest of estimates.
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illegal immigrants