But it's certainly reasonable to assume most of his customers are middle class individuals with enough discretionary income to spend on occasional car washes. The articles point is not that your friend doesn't deserve credit in creating jobs, but the initial creation is only one part. Sustaining those jobs requires sustaining the customers and to do that they must maintain enough discretionary income to spend on car washes. With the income disparity ever increasing it's easy to see the middle class fading and as that happens so shall your friends car wash business.