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The aim of this paper is to examine the value relevance of fair value accounting of biological assets under IAS 41 -Agriculture -using 389 firm-year observations of listed firms in 27 countries worldwide that had adopted IFRS, for the period between 2011 and 2013. In order to operationalize it as the ability of book value to explain market equity value, this study adjusts the original Ohlson model. The results confirm that recognized biological assets are value relevant at fair value and they are more value relevant in firms that exhibit higher disclosure levels. The same results were obtained when this analysis was conducted for bearer biological assets, but when it was applied to consumable biological assets, the results suggest that investors do not value recognized biological assets in firms that exhibit higher disclosure levels. Bearing in mind the current adjustments to IAS 41, according to which firms will be permitted to choose either the cost or the revaluation models for mature bearer plants under IAS 16 -Property, plant and equipment -for annual periods beginning on/or after 1 January 2016, this paper seeks to help standard setters to better understand the market valuation implications of this standard.

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The "smile effect" is a result of an empirical observation of the options' implied volatility with the same expiration date, across different exercise prices. However, its shape has been under discussion seeming to be dependent on the option underlying security. In this paper, and filling up a scarce empirical research on the topic, we used liquid equity options on 9 stocks traded on the London International Financial Futures and Options Exchange (LIFFE) between August 1990 and December 1991. We tested two different hypothesis for testing two different phenomena: (1) the increase of the "smile" as maturity approaches; (2) and the association between the smile and the volatility of the underlying stock. In order to estimate implied volatilities for unavailable exercise prices, we modelled the smile using cubic B-spline curves. We found empirical support for the smile intensification (the U-shape is more pronounced) as maturity approaches as well as when volatility rises. However, we found two major sources of disagreement with the literature on stochastic volatility models. First, as maturity approaches, out-of-themoney options' implied volatility tends to be higher than the implied volatility of in-the-money options. Second, as the volatility of the underlying asset increases, the implied volatility of in-the-money options tends to be higher than implied volatility of out-of-the-money options. -Huang Poon (University of Lancaster) and the attendees of the 26th EFA Annual Conference for helpful comments on previous versions of this paper. We also want to thank to two anonymous referees for their relevant comments and suggestions. Financial support granted by the Fundação para a Ciência e a Tecnologia (FCT) and the Programa Praxis XXI is gratefully acknowledged. 174 J. L. C. Duque and P. Teixeira Lopes