Imagine: One day, you're a gangly 14-year-old girl scarfing a Big Mac at McDonald's.

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One day--maybe not next year or in five years, but eventually--the Big Mac will flatline in the U.S. The evidence: In the past four years McDonald's has averaged only 1% annual same-store sales growth, trailing the 4% average for its main burger rivals.

FORBES: Beyond burgers

One day--maybe not next year or in five years, but eventually--the Big Mac will flatline in the U.S. The evidence: In the past four years McDonald's has averaged only 1% annual same-store sales growth, trailing the 4% average for its main burger rivals, Burger King, Wendy's and Jack-in-the-Box.

FORBES: Beyond Burgers