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Universal Open Access (OA) is fully within the reach of the global research community: Research institutions and funders need merely mandate (green) OA self-archiving of the final, refereed drafts of all journal articles immediately upon acceptance for publication. The money to pay for gold OA publishing will only become available if universal green OA eventually makes subscriptions unsustainable. Paying for gold OA pre-emptively today, without first having mandated green OA not only squanders scarce money, but it delays the attainment of universal OA.
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Stevan Harnad (2010) studied this question.
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