The Merits of Sharing a Ride

The culture of sharing instead of ownership is sharply increasing in individuals behaviors. Particularly in transportation, concepts of sharing a ride in either carpooling or ridesharing have been recently adopted. An efficient optimization approach to match passengers in real-time is the core of any ridesharing system. In this paper, we model ridesharing as an online matching problem on general graphs such that passengers do not drive private cars and use shared taxis. We propose an optimization algorithm to solve it. The outlined algorithm calculates the optimal waiting time when a passenger arrives. This leads to a matching with minimal overall overheads while maximizing the number of partnerships. To evaluate the behavior of our algorithm, we used NYC taxi real-life data set. Results represent a substantial reduction in overall overheads

The Value of Optimization in Dynamic Ride-Sharing: a Simulation Study in Metro Atlanta

Smartphone technology enables dynamic ride-sharing systems that bring together people with similar itineraries and time schedules to share rides on short-notice. This paper considers the problem of matching drivers and riders in this dynamic setting. We develop optimization-based approaches that aim at minimizing the total system-wide vehicle miles and individual travel costs. To assess the merits of our methods we present a simulation study based on 2008 travel demand data from metropolitan Atlanta. The simulation results indicate that the use of sophisticated optimization methods instead of simple greedy matching rules may substantially improve the performance of ride-sharing systems. Furthermore, even with relatively low participation rates, it appears that sustainable populations of dynamic ride-sharing participants may be possible even in relatively sprawling urban areas with many employment centers

Contract Structure, Risk Sharing and Investment Choice

Few microfinance-funded businesses grow beyond subsistence entrepreneurship. This paper considers one possible explanation: that the structure of existing microfinance contracts may discourage risky but high-expected return investments. To explore this possibility, I develop a theory that unifies models of investment choice, informal risk sharing, and formal financial contracts. I then test the predictions of this theory using a series of experiments with clients of a large microfinance institution in India. The experiments confirm the theoretical predictions that joint liability creates two inefficiencies. First, borrowers free-ride on their partners, making risky investments without compensating partners for this risk. Second, the addition of peer-monitoring overcompensates, leading to sharp reductions in risk-taking and profitability. Equity-like financing, in which partners share both the benefits and risks of more profitable projects, overcomes both of these inefficiencies and merits further testing in the field.investment choice, informal insurance, risk sharing, contract design, microfinance,experiment.

Choice f micro-mobility: Case studies of ta public bicycle sharing system in New Zealand

This study considers how to improve understanding of sustainable urban transport planning from the perspective of the Central Business District (CBD) redevelopment process for two cities, Hamilton and Christchurch in New Zealand (NZ). The most proportion of ‘Public Bicycle Share Schemes’ operate in densely populated cities as these are characterized by limited modal accessibility but high population density in the urban CBD. This situation is similar to NZ’s two medium-sized cities, in each of which the city’s population density is constantly increasing in the past years. In this study, Multinomial and Mixed Logistic regression models were used to determine the model specification, and subsequently, to test the mode choice cross-elasticities for promoting greater use of the bicycle sharing system in conjunction with public transport service. The data were gathered using stated preference surveys from 486 New Zealanders, and the modeling results indicate that the potential improvement in a modal shift towards micro-mobility, which can be enhanced by applying different policy options

Two Narratives of Platform Capitalism

Mainstream economists tend to pride themselves on the discipline\u27s resem­blance to science. But growing concerns about the reproducibility of economic research are undermining that source of legitimacy. These concerns have fueled renewed interest in another aspect of economic thought: its narrative nature. When presenting or framing their work, neoliberal economists tend to tell sto­ries about supply and demand, unintended consequences, and transaction costs in order to justify certain policy positions. These stories often make sense, and warn policymakers against simplistic solutionism

Encouraging Sustainable Urban Access: An Exploratory Student Approach to Design of Product Service Systems

Urban access is a key trans-disciplinary design axiom looking to ensure that every member of the society can reach those locations and resources one needs for a sustainable standard of living and productivity. This should be achieved in a way that does not deprive others from their right to access the same urban environment. Crafting the future of urban transportation design is a dynamic process that depends on developing a thorough understanding of the complexity of the human needs that associate with delivering ways to support urban access and, in particular, more sustainable and socially inclusive mobility patterns. New market demands and customer expectations force public and private organisations to expand their commitment to cross-border collaborations to provide attractive alternative transport modes. This paper discusses the challenge of utilizing design innovation as a tool for eco-branding and how an exploratory approach to this has been used in a post-graduate course in Visual Brand Identity and Product Design. Seven research teams, closely guided by the authors, were affiliated with designing an innovative hypothetical bike-sharing scheme for the city of Gothenburg, Sweden, with the potential to captivate road users’ acceptability. An overall description of the project concept and a brief summary of the results produced are presented herein. More specifically, this paper concentrates solely on one of the most innovative projects delivered within the course and discusses how the students adopted the challenge, as well as the actual project outcome and its contribution to the overall learning experience

The Bicycle Boom and Women\u27s Rights

The increasing popularity and widespread use of the bicycle in the United States during the late nineteenth and early twentieth centuries directly contributed to the movement for women’s rights in the following decades. The sense of independence cycling afforded to women, as well as the opportunities for unification in defense of a cause that arose in light of controversies over the pursuit, were important in forming the foundation for later events

Climate coalitions: a theoretical and computational appraisal

Using an updated version of the CWS model (introduced by Eyckmans and Tulkens in Resource and Energy Economics 2003), this paper intends to evaluate with numbers the respective merits of two competing notions of coalition stability in the standard global public goods model as customarily applied to the climate change problem. After a reminder of the model structure and of the definition of the two game theoretical stability notions involved namely, core stability and internal-external stability, the former property is shown to hold for the grand coalition in the CWS model only if resource transfers of a specific form between countries are introduced. It is further shown that while the latter property holds neither for the grand coalition nor for most large coalitions, it is nevertheless verified in a weak sense that involves transfers (dubbed "potential internal stability") for most small coalitions. The reason for this difference is brought to light, namely the differing rationale that inspires the transfers in either case. Finally, it is shown that the stable coalitions that perform best (in terms of carbon concentration and global welfare) always are composed of both industrialized and developing countries. Two sensitivity analyses confirm the robustness of all these results.climate change, coalitions, simulation, integrated assessment

First Principles for an Effective Rewrite of the Telecommunications Act of 1996

The increasing centrality of the Internet in modern communications, together with massive changes in the landscape of the telecommunications market, have intensified the calls for Congress to overhaul the Telecommunications Act of 1996. In this paper, we analyze this looming legislative challenge by dividing it into two sets of issues: first, issues concerning the proper substance of telecommunications policy reform; and, second, issues concerning the appropriate institutions for carrying out that reform. In Part I, we argue that Congress should require regulators to adhere more closely to (and justify departures from) basic antitrust principles in developing the substance of competition policy. In particular, we explore how those principles would have brought greater predictability and analytical rigor to the FCC's implementation of statutory provisions requiring incumbent telephone providers to lease parts of their networks to competitors. Moreover, we explain how antitrust principles can now inform the current debate over whether to regulate broadband platforms to prevent discrimination against independent providers of applications like voice over Internet protocol. In Part II, we turn to Congress's institutional choices in reforming telecommunications regulation.Despite our advocacy for antitrust-oriented rules of decision, we argue for a continued reliance on the FCC, rather than antitrust courts, as the appropriate institution for superintending the efficient development of competition throughout the industry.Not only does the FCC enjoy specialized expertise in the economics and technology of the telecommunications industry, it also enjoys a distinct advantage over courts in developing and enforcing complicated ,and necessary,prescriptive rules, such as those governing interconnection and its associated intercarrier fees. At the same time, the FCC will increasingly need to refocus its energies from prescriptive regulation to a new emphasis on after-the-fact enforcement and market-monitoring, much like the role played today by the Federal Trade Commission.