We study fairness and efficiency properties of randomized algorithms for barter exchanges with direct applications to kidney exchange problems. It is well documented that randomization can serve as a tool to ensure fairness among participants. However, in many applications, practical constraints often restrict the maximum allowed cyclelength of the exchange and for randomized algorithms, this i...

in this paper, based on a new keynesian structure, we have analyzed monetary policy response to exchange rate volatilities in iran. for this purpose, first, exchange rate derived from equilibrium condition in exchange market and then two different models have been estimated. assumption on the first model is that central bank responses to exchange rate volatilities and the assumption on the seco...

A central problem ill empirical macroeconomics is to determine when and how much the exchange rate is misaligned. This paper clarifies and calculates the concept of’ the equilibrium real exchange rate, using a structural vector auto regression (VAR) model. By imposing long—run restrictions on a VAR model for Iran, lour structural shocks are identified: nominal demand, real demand, supply and oi...

We introduce the half-cycle formulation (HCF), a new integer programming (IP) model for kidney exchange problem, which has life-saving applications. In HCF, cycle (i.e., set of swaps) is represented by two compatible halves. After giving several algorithmic enhancements we show through extensive computational experiments with an IP solver that our outperforms existing formulations when size lim...