NY Times [nytimes.com]:
A quarter-century ago, there were 56 teenagers in the labor force for every “limited service” restaurant — that is, the kind where you order at the counter.
Today, there are fewer than half as many, which is a reflection both of teenagers’ decreasing work force participation and of the explosive growth in restaurants.
But in an industry where cheap labor is an essential component in providing inexpensive food, a shortage of workers is changing the equation upon which fast-food places have long relied. This can be seen in rising wages, in a growth of incentives, and in the sometimes odd situations that business owners find themselves in.
Too many restaurants, not enough teens to work in them.