(9)Where the liquidity in a sovereign debt market falls below a certain threshold, the restrictions on investors entering into uncovered short sales of sovereign debt may be lifted temporarily for the purpose of stimulating liquidity in that market. Where there is a significant fall in the value of a financial instrument on a trading venue, competent authorities may prohibit, restrict short selling or otherwise limit transactions in that instrument. There are a wide variety of instruments and it is necessary to specify the threshold for each of the different classes of financial instruments taking into account, differences such as those between the instruments and the different volatilities of their respective markets.