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α: calibrated so average coauthorship-adjusted count equals average raw count
This article focuses on the difference between market makers and limit orders in their role as suppliers of liquidity. For both sources of liquidity I analyze the price behavior of stocks and options around large option trades and I estimate the premium paid by the initiator of the large trade. My findings suggest that limit orders for options are "picked off" after adverse changes in the underlying stock price. Furthermore, I find that for these transactions there is a permanent change in quotations in the direction of the transaction. After transactions where market makers supply liquidity, quotes tend to return to their pretrade level. Article published by Oxford University Press on behalf of the Society for Financial Studies in its journal, The Review of Financial Studies.