Happy Birthday Big Mac(TM)

The Big Mac turns 40 years old today. (Guess where I'm going for lunch?)

Not really the first triple-decker hamburger sandwich, Bob's Big Boy had a double and triple before Micky D, but certainly one of the most famous food icons of all time.

I think one of the main reasons for its longevity is the catchy "Two all beef patties . . . " jingle.

What do you think? Why has the Big Mac lasted?

And, what lessons could you learn from the history of the Big Mac to help you think differently about what you do?