Efficiency defense: Possible mitigating effects in presence of imperfect redistribution tools

It is often argued that, first, the decision criterion of antitrust authorities should be total social welfare and that, second, mergers increasing the value of this criterion but ending with lower consumer surplus should be allowed in the name of efficiency gains realized by merging firms. This paper studies merger control by a government with, first, preferences over wealth distribution among agents (weights to put on consume surplus and firms profit) and, second, imperfect redistribution tools. It shows that in such a case merger policy can not be parted off redistribution policy.Surplus Analysis, Merging Analysis, Redistribution, Distortive Taxation.

On the Integrability of Supersymmetric Versions of the Structural Equations for Conformally Parametrized Surfaces

The paper presents the bosonic and fermionic supersymmetric extensions of the structural equations describing conformally parametrized surfaces immersed in a Grasmann superspace, based on the authors' earlier results. A detailed analysis of the symmetry properties of both the classical and supersymmetric versions of the Gauss-Weingarten equations is performed. A supersymmetric generalization of the conjecture establishing the necessary conditions for a system to be integrable in the sense of soliton theory is formulated and illustrated by the examples of supersymmetric versions of the sine-Gordon equation and the Gauss-Codazzi equations