I love a good hamburger, I even a not so good once in a while.
The modern hamburger was created because of rapidly changing society due to industrialization.  They needed mass produced food once a middle class emerged.
Interesting, do you mean like McDonald's?
Yes but Mcdonald's originally sold hot dogs and then hamburgers were later added for .10 a piece.
That was cheap!  And do you remember how much they cost now, it is been a while since I've eat there.
It depends on the hamburger, from 1.00 to 5.00.  There's also cheeseburgers which mean the burger is topped with cheese.