Can someone explain what is the "Better Mousetrap theory" to
me?
I scourge through the internet but still cant understand what
are they trying to explain especially about the part where someone
beat your path to the door or so. 
And my teacher came up with some swiss knife example. Does
anyone know this too?
Thanks for all help!!
The Better Mousetrap theory - Build a better mousetrap,
and the world will beat a path to your door
It means that if you got a better idea than someone else, the
crowd will come to you automatically. Key word here is
'automatically'
'the world will beat a path to your door' means that the world
will come to you...
An example of the Mousetrap theory : You invented a 'thing', but
you did not market it to the stores or publicise it. But still
people come to you for your invention. (or come to you
automatically)