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Statistik › Intraday und Marktmikrostruktur › The 2008 short ban

The 2008 short selling ban worked as intended and made the banned stocks worse to trade

KennzahlEffectt
Daily shares sold short-513,087-5.51
Daily number of short sale trades-1,967-7.03
Short sales as a share of volume-11.78pp-7.12
Daily dollar volume-$34.8m-2.56
Daily number of trades-1,257-4.01
Relative quoted spread+37bp2.11
Relative effective spread+32bp3.01
Five minute relative price impact+11bp2.08
Intraday range+3.82pp4.98

Two way fixed effects panel regression estimates for 465 banned financial stocks against 465 matched controls, window 1 August to 31 October 2008. The ban itself ran 19 September to 8 October 2008. Effects are larger in large caps; the smallest market capitalisation quartile shows no significant worsening of market quality.

Short sales in the banned stocks fell 11.78 percentage points as a share of volume. Quoted spreads widened about 37 basis points, effective spreads about 32, and the intraday range rose 3.8 percentage points. The smallest quartile showed no significant worsening.

-11.78ppFall in short sales as a share of volume, t = -7.12
+37bpIncrease in the relative quoted spread, t = 2.11
+3.82ppIncrease in the intraday range, t = 4.98
Not the smallestMarket cap quartile showing significant market quality damage

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