There’s no uniform way to elicit a response from consumers. No one response mechanism to rule them all. Different people (and groups of people) respond in different ways, to different kinds of mechanisms.
Take millennials, that frequently spoken about, sometimes maligned, section of the population born somewhere between the mid-1980s and the late-1990s. A section of society who emerged into adulthood during an age defined both by financial crisis, extraordinary technological change, and the explosion of social media. A generation that now represents one of the most dominant demographics on the retail landscape; with buying triggers shaped by the world into which they've grown.