Emerging markets efficiency has been widely investigated, with mixed results. However such evidence is only reliable if the methodology adopted accounts for the institutional features of the market. Unlike previous studies this paper corrects for thin trading and incorporates possible non-linear behaviour and regulatory changes. Using Istanbul Stock Exchange data we show that in its early years the exchange was characterised by non-linear behaviour and inefficient pricing. However, regulatory changes encouraged participation, improved information quality and led to prices impounding information more rapidly, suggesting markets become efficient with high trading volume, reliable information and an appropriate institutional framework.
Although there is a widespread belief that stock markets are weak-form efficient, technical analysis is a pervasive activity. The extent is examined to which this apparent paradox can be explained by conditioning the past sequence of prices on the past sequence of volume. A unique data set from an emerging market reveals that, for a number of companies in the sample, returns appear to conform to the weak-form version of the efficient markets hypothesis. However, when returns are conditioned on past levels of volume, current returns on over half of these companies exhibit predictability. This is particularly true from companies with low trading volumes.
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