The authors study a simple model of an asset market with informed and non-informed agents. In the absence of non-informed agents, the market becomes information efficient when the number of traders with different private information is large enough. Upon introducing non-informed agents, the...

The authors study a simple model of an asset market with informed and non-informed agents. In the absence of non-informed agents, the market becomes information efficient when the number of traders with different private information is large enough. Upon introducing non-informed agents, the...

The presence of long-range memory in financial time series is a puzzling fact that challenges the established financial theory. We study the effect of liquidity on the efficiency (measured by the Hurst's exponent) of the Thai Stock Market. According to our study, we find that: (i) The R/S method...

This study examines the cross-market efficiency of the FTSE/MIB index options contracts traded on the Italian derivatives market (IDEM) between 1st October 2007 and 31st December 2012, a period including the financial crisis, using daily option prices. Two fundamental no-arbitrage conditions are...

Exploiting cross-sectional and time-series variations in European regulations during the July 2008 – June 2009 period, we show that: Prohibition on covered short selling raises bid-ask spread and reduces trading volume, prohibition on naked short selling raises both volatility and bid-ask...

Exploiting cross-sectional and time-series variations in European regulations during the July 2008 – June 2009 period, we show that: 1) Prohibition on covered short selling raises bid-ask spread and reduces trading volume, 2) Prohibition on naked short selling raises both volatility and...

This paper reviews the market reaction to bank rescue packages announced in six countries between October 2008 and January 2009. The study distinguishes the impact on creditors as seen in the change of CDS spreads from the impact on shareholders as seen in the movement of bank stock prices....