Open Access in a Nutshell

Talking of open access, here's the one paragraph explanation of its economics:

The central idea of ‘author-side’ payment in order to secure open access for the formally published research literature (and as a side benefit, transparency of the proportionality between the amount of research done and the cost of the literature) is to use the same money now used for subscriptions (reader-side payment) in a different way. Not extra money; the same money.

(Via Open Access News.)