[Thanks to TOP]
Ralp Waldo Emerson did not actually say any thing about "a better mousetrap". It was a perversion of what he did say, and which I find has much broader relevance:
"If a man has good corn or wood, or boards, or pigs, to sell, or can make better chairs or knives, crucibles or church organs, than anybody else, you will find a broad hard-beaten road to his house, though it be in the woods." —Ralph Waldo Emerson,