I think soda's popularity is proof of the power of marketing. The "sip test" was thought to be flawed because taking a sip of something is completely different

I think soda's popularity is proof of the power of marketing. The "sip test" was thought to be flawed because taking a sip of something is completely different than drinking a glass of something. New Coke might be a better example since supposedly it was formlated to beat Pepsi in the sip test but failed miserably in the market.