Perhaps it's been on HN already, but this video [1] uses a books-from-different-vendors, one-shipping-company analogy. Plain-speaking and clear IMO. [1] https

Perhaps it's been on HN already, but this video [1] uses a books-from-different-vendors, one-shipping-company analogy. Plain-speaking and clear IMO. [1] https://www.youtube.com/watch?v=NAxMyTwmu_M https://www.youtube.com/watch?v=NAxMyTwmu_M