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Paul A. Spindt, J. Ronald Hoffmeister, The Micromechanics of the Federal Funds Market: Implications for Day-of-the-Week Effects in Funds Rate Variability, The Journal of Financial and Quantitative Analysis, Vol. 23, No. 4 (Dec., 1988), pp. 401-416
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Spindt et al. (1988) studied this question.
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