Which consumer psychology principle led to the 'New Math' textbook marketing revolution of the 1960s, causing publishers to completely redesign their mathematics education products?

In the world of mathematics education products, branding strategies have evolved significantly over the decades. Publishers and EdTech companies employ various techniques to differentiate their offerings in this competitive market. This poll tests your knowledge about a fascinating consumer psychology phenomenon related to mathematics textbooks and learning tools that has influenced product development and marketing strategies across the industry.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The Zeigarnik Effect - consumers' tendency to remember uncompleted tasks better than completed ones
The Sputnik Shock - fear that Soviet education was superior, creating demand for 'modern' mathematics approaches
The Hawthorne Effect - students performed better when they believed they were using innovative materials
The Decoy Pricing Effect - publishers introduced premium editions to make standard textbooks seem more affordable