Which pricing strategy in mathematics education publishing is known as the 'Golden Ratio Pricing Model'?

Pricing strategies in mathematics education products involve complex calculations and market analysis. Publishers of textbooks, educational software, and learning tools must balance accessibility with profitability. This poll tests your knowledge about a specific pricing phenomenon that affects how mathematical tools and resources are priced and distributed in educational markets worldwide.

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Setting the digital version price at exactly 61.8% of the physical textbook price, reflecting the golden ratio in nature
Pricing educational software at a perfect square value (e.g., $16, $25, $36) to appeal to the mathematical sensibilities of customers
Incrementing prices of sequential editions by exactly π percent each year to create a mathematical growth pattern
Setting different regional prices according to a logarithmic scale based on each country's mathematics proficiency rankings