Which pricing strategy helped a leading mathematics software company increase its educational market share by 85% between 2018-2022?

In the competitive world of mathematical software and educational tools, pricing strategies can make or break a product's success. Companies use various psychological and mathematical principles to determine optimal price points. This trivia question explores one of the most successful yet counterintuitive pricing approaches used by a major mathematics software provider that revolutionized the educational market.

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The 'Golden Ratio Pricing' model - setting prices at approximately 1.618 times the production cost
The 'Decoy Effect' - offering three tiers where the middle option was intentionally designed to push users toward the premium option
The 'Prime Number Subscription' - charging slightly below round numbers (e.g., $19.97 instead of $20) to create perception of value
The 'Fibonacci Scaling' - starting with a low base price that increases according to the Fibonacci sequence for additional features