[Polylactic_acid]

This doesn't seem right.

>quality product, everyone has already heard of

They reached this status due to advertising, Its likely they could drop advertising for a while and coast along fine but eventually that brand recognition will start to drop.

There is also the fact that a lot of products are purchased not based on fixed needs but flexible wants. Maybe I haven't purchased a soft drink in a while and I don't think about it, an advert could make me think about it and make me want it again.