Someone made a bunch of money a few years ago selling singing pickles. Doubt there was a sudden human need for singing pickles. Someone created that demand.
If they made the choice by their own volition (even if it's influenced by the marketing) may be they had some need for entertainment or consumerism fulfilled by it?
To disprove supply/demand means that no matter the price of the pickles the number of pickles sold wouldn't change.
To disprove supply/demand means that no matter the price of the pickles the number of pickles sold wouldn't change.