European Business Schools Librarian's Group

Les Cahiers de Recherche,
HEC Paris

No 770: Market informational inefficiency, risk aversion and quantity grid

Stefano LOVO () and Jean-Paul DECAMPS ()
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Jean-Paul DECAMPS: GREMAQ-IDEI Universite de Toulouse 1

Abstract: In this paper we show that long run market informational inefficiency is perfectly compatible with standard rational sequential trade models. Our inefficiency result is obtained taking into account two features of actual financial markets: tradable quantities belong to a quantity grid and traders and market makers do not have the same degree of risk aversion. The implementation of our model for reasonable values of the parameters suggests that the long term deviations between asset prices and fundamental value are important. We explain the ambiguous role of the quantity grid in exacerbating or mitigating market inefficiency. We show that stock splits can improve the information content of the order flow and consequently increase price volatility.

Keywords: informational efficiency; quantity grid; stock splits

JEL-codes: D82; D83; G14

33 pages, January 9, 2003

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