The proof of the theorem of existence of the ruptures, namely the proof of maximality, is improved. The theorem may be used in economics and explain the well-known problems such as Allais’ paradox. Illustrated examples of ruptures are presented.

An established result of the endogenous growth literature is that laissez-faire equilibria in expanding-varieties models are suboptimal due to the rent-effect: monopolistic pricing drives the equilibrium quantity of each intermediate input below the efficient level, implying that it is optimal...

A HIGHLY IMPROVED VERSION OF THIS PAPER CAN BE FOUND AT http://english.mnb.hu/Kiadvanyok/mnben_mnbfuzetek/mnben_elozo/mnben_WP_2010_8 This paper provides a comprehensive analysis of the relative performance of inflation targeting, price level targeting, and hybrid targeting of them in a simple...

We study monetary policy at the ZLB in a traceable three-period model, in which price-level targeting emerges endogenously in the welfare function. We characterize optimal price-level forward guidance under discretion and commitment. Potentially non-monotonic discretionary welfare losses are...

This paper provides a comprehensive analysis of the relative performance of inflation targeting, price level targeting, and hybrid targeting of them in a simple three-period steady state to steady state economy facing transmission lag, and derives optimal policies implementing commitment...

Unemployment Accounts (UA) are mandatory individual saving accounts that can be used by governments as an alternative to the Unemployment Insurance (UI) system. I study a two tier UA-UI system where the unemployed withdraw from their unemployment account until it is exhausted and then receive...