The first stage in a technology's advance is that it'll fall below a critical price. After it falls below a critical price it will tend if it's successful to rise above a critical mass a penetration.

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But my view is that you need a system at the border. You need some fencing but you need technology. You need boots on the ground. And then you need to have interior enforcement of our nation's immigration laws inside the country. And that means dealing with the employers who still consistently hire illegal labor.