Which e-commerce platform pioneered the 'pay-what-you-want' pricing model for mathematics teaching resources, significantly disrupting traditional educational publishing?

The digital transformation of mathematics education has been dramatic over the past decade. E-commerce platforms specializing in mathematics resources have revolutionized how students and teachers access educational materials, how concepts are taught, and how learning is personalized. These platforms have created new business models in educational publishing and changed the economics of mathematics education. Test your knowledge about this industry transformation!

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Teachers Pay Teachers (TpT)
Khan Academy Marketplace
MathXchange
Wolfram Resource Network