Nuclear Multifragmentation Critical Exponents

We show that the critical exponents of nuclear multi-fragmentation have not been determined conclusively yet.Comment: 3 pages, LaTeX, one postscript figure appended, sub. to Phys.Rev.Lett. as a commen

Zipf's Law and the Universality Class of the Fragmentation Phase Transition

We show that Zipf's Law for the largest clusters is not valid in an exact sense at the critical point of the fragmentation phase transition, contrary to previous claims. Instead, the extracted distributions of the largest clusters reflects the choice of universality class through the value of the critical exponent tau.Comment: Conf. Proceeding for VI Latin American Symposium on Nuclear Physics and Applications, Iguazu, Argentina, October 200

How Changing Prudence and Risk Aversion Affect Optimal Saving

We show how optimal saving in a two-period model is affected when prudence and riskaversion of the underlying utility function change. Increasing prudence alone will induce higher savings only if, for certain combinations of the interest rate and the pure time discount rate, there is distributional neutrality between the two periods. Otherwise, changes of risk aversion that affect the distribution between the periods must also be taken into account.prudence, risk aversion, saving, intergenerational distribution