Unskilled illegal labor is so cheap that businessmen do not invest in technology that would make Americans more productive. So, what really happens is business chases cheap labor because it is cheap. Communities subsidize the cheap labor raising the cost to Americans. Illegals have a net contribution in the red leading to a downward spiral, which is what we are now going through, negative growth. Greenspan is either senile or a liar. In other words he is not worth listening to.
you’re absolutely correct. they’re a disincentive to modernization.