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This study is an investigation into the cross-sectional determinants of stock returns in a small market - the Athens Stock Exchange - where the Fama and French portfolio grouping procedure that is normally used to counter the error in variables problem in estimating beta is problematic due to the small number of stocks. A maximum likelihood technique is applied, similar to that developed by Litzenberger and Ramaswamy (Journal of Financial Economics, 7, 163-95, 1979), which is arguably a better procedure than the portfolio grouping method even for investigating large (developed) markets. A further empirical problem that was addressed was the possibility that the results were being driven by the 'January effect'. The findings for the Athens market suggest that there is only one substantive variable in explaining the cross-sectional variation of market and that is market equity ME (which captures a size effect).

The Dodd-Frank Act has produced a new wave of bank M&As. This consolidation trend is mainly driven by mergers of small banks, since small banks feel the need to merge in order to absorb the compliance costs of the new regulation. We document that the $10 billion asset-size threshold has become the ceiling of the optimal scale for bank combinations, given that banks below this $10 billion mark avoid several regulatory hurdles imposed by the Dodd-Frank Act. Results for these "less than $10 billion mergers" suggest significant value creation for both firms' shareholders: Bidders experience large anticipated wealth gains during the passage of the legislation since the market had ex-ante identified these bids. Consequently, at the deal announcement date, bidders experience insignificant returns, targets experience large abnormal returns and the combined abnormal returns are statistically positive. Finally, bidders experience positive abnormal returns at the deal completion date. On the contrary, results for larger bank mergers indicate a redistribution of wealth from the bidder to the target firm.

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