What do Apple, Starbucks, Dyson and Pret a Manger have in common? How do they achieve spectacular growth, leaving behind former tried-and-true brands to gasp their last? The old checklist of P's used by marketers - Pricing, Promotion, Publicity - aren't working anymore. The golden age of advertising is over. It's time to add a new P - the Purple Cow. Purple Cow describes something counterintuitive and flat-out unbelievable.