Change goes beyond trade (giving up something for something else). Change is about abandoning one's very nature, modifying it. You can change your shirt but there's no way back when YOU change. Change has a cost and an impact. It is both a sacrifice and an opportunity. You often grow stronger after a change but you often are weak during the change. Change is somehow more radical than evolution, quicker too.
(answer to the question "CHANGE - What does it mean to you?")