HOW MANY MORE CITES IS A $3,000 OPEN ACCESS FEE BUYING YOU? EMPIRICAL EVIDENCE FROM A NATURAL EXPERIMENT
利用数学和经济学期刊的混合开放获取试点协议作为自然实验，研究发现总体上开放获取并未带来引用优势，但对没有预印本或后印本的文章有正向效应。
We analyze the effect of open access (OA) status of journal articles on citations. Using cross‐sectional and panel data from mathematics and economics, we perform negative binomial, Poisson, and generalized method of moments/instrumental variable methods regressions. We benefit from a natural experiment via hybrid OA pilot agreements. Citations to pre‐prints allow us to identify the intrinsic quality of articles prior to journal publication. Overall, our analysis suggests that there is no hybrid OA citation benefit. However, for the subpopulation of articles without OA pre‐ or post‐prints, we find positive hybrid OA effects for the full sample and each discipline separately.