this symposium from 19 of the discipline's most innovative empirical researchers is gratifying and goes a long way toward bringing issues of replication and data accessibility into public view. The progress made in the preceding pages clearly demonstrates the virtues of a community of scholars willing to share sufficient information to benefit from each other's work. Areas of Agreement This symposium reveals widely differing views about specific data replication policies. The proposals

Abstract A portfolio optimization problem consists of maximizing an expected utility function of n assets. At the end of a typical time period, the portfolio will be modified by buying and selling assets in response to changing conditions. Associated with this buying and selling are variable transaction costs that depend on the size of the transaction. A straightforward way of incorporating these costs can be interpreted as the reduction of portfolios ’ expected returns by transaction costs if the utility function is the mean-variance or the power utility function. This results in a substantially higher-dimensional problem than the original n-dimensional one, namely (2K + 1)ndimensional optimization problem with (4K + 1)n additional constraints, where 2K is the number of different transaction costs functions. The higher-dimensional problem is computationally expensive to solve. This two-part paper presents a method for solving the (2K + 1)n-dimensional problem by solving a sequence of n-dimensional optimization problems, which account for the transaction costs implicitly rather than explicitly. The key idea of the new method in Part 1 is to formulate the optimality conditions for the higher-dimensional problem and enforce them by solving a sequence

1) typos in the text (which have now been addressed by issuance by the Journal of a corrigendum), and 2) various aspects of originality and accuracy to measure specific airway resistance (sRaw), as described in Lofgren et al. (10). First, we would like to reiterate our view that the work of the late K. P. Agrawal (2, 9) impacted substantially the techniques devel-oped in our laboratory for study of mice and larger animal species (3, 4). Specifically, K. P. Agrawal opened the door to measurement of sRaw during tidal breathing in animals (2) and humans (9), by providing a computational approach to avoid heating and humidification errors. These advances were par-ticularly germane to applications of whole body plethysmog-raphy originally described by Dubois et al. (7) to conscious animals. Our data in a variety of species support those princi-ples. However, the physical properties of the device we created

particularly in sociopolitical opinion mining and aids policy makers, social organizations or government sectors in decision making. In this paper we study the problem of detecting thoughtful comments. We empirically study various textual features, discourse relations and relevance features to predict

are characteristic of normal human thought. Moreover, these illusions appear to promote other criteria of mental health, including the ability to care about others, the ability to be happy or contented, and the ability to engage in productive and creative work. These strategies may succeed, in large part, because

of earnings forecasts and heightened professional skepticism on the

Tjomme Rusticus for his excellent assistance on data collection. Financial support

Tjomme Rusticus for his excellent assistance on data collection. Financial support

“Complete market theory of the maturity structure ” generates quantitatively implausible results

Optimal taxation is analyzed under a Rawlsian criterion in an economy where the only decision of the agents is to participate, or not, to the labor force. The model allows for heterogeneity both in the agent’s productivities and aversions to work. At a first best optimal schedule, the marginal agent who decides to work pockets all of her productivity, while being just compensated for her work aversion. When the planner does not observe work aversion, financial compensation for work is lower than productivity. Theory puts little restrictions on the shape of the optimal tax schedules. The usual first order conditions involving the elasticities of participation only apply for sufficiently regular economies. We qualitatively show how the optimal incentives schemes depend on the underlying structure of the preferences: 100 % marginal tax rates or subsidies to work are related to specific features of the economies.