World monies or money-worlds: A new perspective on cryptocurrencies and their moneyness

This essay makes the case that current debates about the ‘moneyness’ of Bitcoin and other cryptocurrencies are occurring at the incorrect scale. Rather than being some form of trans-national digital money to be used alongside or compete with national fiat currencies, I argue that, instead, each cryptocurrency represents its own self-contained ‘money-world’. Put differently, a cryptocurrency is the uniquely specified unit of account and medium of exchange within the socio-technical bounds of its own blockchain. This new perspective can open new lines of intellectual dialogue and inform better policy choices for regulating cryptocurrencies

A combinatorial auction-based approach for ridesharing in a student transportation system

Here, a mixed-integer linear programming model is developed to represent a transportation system of students traveling from/to a university campus. The concept of ridesharing is used and the mechanism of combinatorial auctions is incorporated within a routing-based model. The mathematical model is based on the vehicle routing problem along with appropriate constraints accommodating features that express the auction clearing phase. A hybrid heuristic-based optimization framework, that takes advantage of meta-heuristic algorithms to improve an initial solution, is also developed to solve large-sized instances of the problem. Three meta-heuristics, namely particle swarm optimization, dragonfly algorithm, and imperialist competitive algorithm, are implemented in the proposed framework, whose performances are assessed and compared. Moreover, two improvement heuristic procedures that attempt to improve the outcomes of the foregoing meta-heuristics are proposed and compared as well. © 2021 The Authors. Networks published by Wiley Periodicals LLC