Source: Sangeet Paul Choudary, Platform Scale (2015)
"At their core, platforms enable a plug-and-play business model. Other businesses can easily connect their business with the platform, build products and services on top of it, and co-create value. Platforms primarily benefit not from internal production but from a wider source of open co-creation and open market interactions. This ability to drive interactions through a plug-and-play infrastructure is a defining characteristic of platform scale." (p. 33)
N.B. I took 9 pages of 10pt font notes on this text. Reach out if you care for the full version (for educational purposes only), which is simply too heavy to append here.