Constraints 123
market makers, the naked sale of sovereign debt and the naked holding of
sovereign CDS remain possible in case of holding of assets or liabilities, the
prices of which are correlated with those of sovereign debt, such as the secu-
rities issued by banks of the same nationality.
− Short sales can be adjourned till the end of the next trading day in case of
sharp price falls. Thresholds, introducing a cap on negative price changes
in absolute value, which act as “circuit- breakers”, are set for the dierent
categories of nancial instruments (shares, sovereign securities, corporate
bonds, etc.) and depending on the degree of liquidity of their market (e.g.
the threshold is 10% for the most liquid shares).
− National regulat