english: And so the lesson is this: it doesn't really matter what you're selling; you just have to think about who is your customer, and what are the messages that are going to get them to change their behavior.
non_english: Ponaučenie je nasledovné: nezáleží, čo v skutočnosti predávame, v prvom rade musíme myslieť na to, kto je náš zákazník a ktoré posolstvá zmenia ich správanie.