Slippery slope
From Wiki
The slippery slope marketing video above is a part of the Theme Zoom blog post called Irresistible Offer plus Slippery Slope: The Neuromarketing Secret and Key to Human Happiness.
The subject matter authority on the neurosocial dynamics of cognitive dissonace or slippery slope is Carol Tavris.
Also See Seven Step Buying Cycle Process
Also See Carol Tavris and Mistakes Were Made But Not By Me
Also See Zeirgarnik Effect
Also See Network Empire's Content Curation Course - Cash Micro-Content Curation, Syndication and Publishing at the Speed of Thought