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In order to make money, a traditional publisher – say, a magazine – first has to cover a multitude of costs: it pays writers for the articles; it employs editors to commission, shape and check the articles; and it pays to distribute the finished product to subscribers and retailers. All of this is expensive, and successful magazines typically make profits of around 12-15%.

The way to make money from a scientific article looks very similar, except that scientific publishers manage to duck most of the actual costs. Scientists create work under their own direction – funded largely by governments – and give it to publishers for free; the publisher pays scientific editors who judge whether the work is worth publishing and check its grammar, but the bulk of the editorial burden – checking the scientific validity and evaluating the experiments, a process known as peer review – is done by working scientists on a volunteer basis. The publishers then sell the product back to government-funded institutional and university libraries, to be read by scientists – who, in a collective sense, created the product in the first place.