EA: Early Advantage: Self-archiving preprints before publication hastens and increases citations (higher- quality articles benefit more: top 20% of articles receive 80% of citations) QA: Quality Advantage: Self-archiving postprints immediately upon publication hastens and increases citations (higher-quality articles benefit more) UA: Usage Advantage: Self-archiving increases downloads (higher-quality articles benefit more) (CA: Competitive Advantage): OA/non-OA advantage (CA disappears at 100%OA, but very important today!) (QB: Quality Bias): Higher-quality articles are self- selectively self-archived more (QB disappears at 100%OA) Contributors to the OA Advantage EA + QA + UA + (CA) + (QB)
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