Beyond the dichotomy: How ride-hailing competes with and complements public transport

Since ride-hailing has become an important travel alternative in many cities worldwide, a fervent debate is underway on whether it competes with or complements public transport services. We use Uber trip data in six cities in the United States and Europe to identify the most attractive public transport alternative for each ride. We then address the following questions: (i) How does ride-hailing travel time and cost compare to the fastest public transport alternative? (ii) What proportion of ride-hailing trips do not have a viable public transport alternative? (iii) How does ride-hailing change overall service accessibility? (iv) What is the relation between demand share and relative competition between the two alternatives? Our findings suggest that the dichotomy—competing with or complementing—is false. Though the vast majority of ride-hailing trips have a viable public transport alternative, between 20% and 40% of them have no viable public transport alternative. The increased service accessibility attributed to the inclusion of ride-hailing is greater in our US cities than in their European counterparts. Demand split is directly related to the relative competitiveness of travel times i.e. when public transport travel times are competitive ride-hailing demand share is low and vice-versa.

Precise display time measurement in JavaScript for web-based experiments

Conducting research via the internet is a formidable and ever-increasingly popular option for behavioral scientists. However, it is widely acknowledged that web-browsers are not optimized for research: In particular, the timing of display changes (e.g., a stimulus appearing on the screen), still leaves room for improvement. So far, the typically recommended best (or least worst) timing method has been a single requestAnimationFrame (RAF) JavaScript function call within which one would give the display command and obtain the time of that display change. In our Study 1, we assessed two alternatives: Calling the RAF twice consecutively, or calling the RAF during a continually ongoing independent loop of recursive RAF calls. While the former has shown little or no improvement as compared to single RAF calls, with the latter we significantly and substantially improved overall precision, and achieved practically faultless precision in most practical cases. In Study 2, we reassessed this “RAF loop” timing method with images in combination with three different display methods: We found that the precision remained high when using either visibility or opacity changes – while drawing on a canvas element consistently led to comparatively lower precision. We recommend the “RAF loop” display timing method for improved precision in future studies, and visibility or opacity changes when using image stimuli. We have also shared, in public repositories, the easy-to-use code for this method, exactly as employed in our studies.

A Characterization of Lexicographic Preferences

This paper characterizes lexicographic preferences over alternatives that are identified by a finite number of attributes. Our characterization is based on two key concepts: a weaker notion of continuity called “mild continuity” (strict preference order between any two alternatives that are different with respect to every attribute is preserved around their small neighborhoods) and an “unhappy set” (any alternative outside such a set is preferred to all alternatives inside). Three key aspects of our characterization are as follows: (i) we use continuity arguments; (ii) we use the stepwise approach of looking at two attributes at a time; and (iii) in contrast with the previous literature, we do not impose noncompensation on the preference and consider an alternative weaker condition.

Reasons and Their Roles

This chapter outlines a job description for practical reasons—they justify actions, guide deliberation, and explain normative facts, such as facts about what a person ought to do. Reflection on this job description leads to a provisional answer to the question of what being a reason consists in: A reason for a person to act is evidence of a respect in which it is right for them to act. The chapter compares this view critically with two alternatives—that reasons are explanations of right-makers, rather than evidence of them, and that reasons are premises of good reasoning. It also defends the evidence-based account against objections.

Beyond Turing: far-from-equilibrium patterns and mechano-chemical feedback

Turing patterns are commonly understood as specific instabilities of a spatially homogeneous steady state, resulting from activator–inhibitor interaction destabilized by diffusion. We argue that this view is restrictive and its agreement with biological observations is problematic. We present two alternatives to the classical Turing analysis of patterns. First, we employ the abstract framework of evolution equations to enable the study of far-from-equilibrium patterns. Second, we introduce a mechano-chemical model, with the surface on which the pattern forms being dynamic and playing an active role in the pattern formation, effectively replacing the inhibitor. We highlight the advantages of these two alternatives vis-à-vis the classical Turing analysis, and give an overview of recent results and future challenges for both approaches. This article is part of the theme issue ‘Recent progress and open frontiers in Turing’s theory of morphogenesis’.

Status Quo Sorrows: The Failures of Energy Project Consultations and Reconciliatory Paths Forward

Canada’s prevailing Aboriginal consultation regime for major energy projects is not working. Indeed, Indigenous peoples, industry proponents, and the Crown have all expressed increasing frustration and dismay at the uncertainty and acrimony that a legal regime intended to facilitate reconciliation between Canada and Indigenous peoples has counterproductively generated. In this paper, I describe the underlying principles of a process-oriented reconciliation that animate the Court’s jurisprudence on section 35 of the Constitution Act, 1982. I then identify the failures in effectively translating these principles to the major energy context, focusing in particular on the harms generated by the lack of accountability and transparency of the National Energy Board/Canada Energy Regulator administrative scheme. I finally consider two alternatives or additions to contemporary resource project consultations – namely, Impact and Benefit Agreements (IBAs) and a proposed Indigenous veto – finding that an Indigenous veto may be an especially effective means of introducing greater equity, fairness, and certainty to major energy project development in Canada, to the benefit of all relevant stakeholders.

The Condorcet Jury Theorem with Information Acquisition

We analyze a committee decision in which individuals with common preferences are uncertain which of two alternatives is better for them. Members can acquire costly information. Private signals and information choice are both continuous. As is consistent with Down’s rational ignorance hypothesis, each member acquires less information in a larger committee and tends to acquire zero information when the committee size goes to infinity. However, with more members, a larger committee can gather more aggregate information in equilibrium. The aggregate information is infinite with the size going to infinity if and only if marginal cost at “zero information acquisition” is zero. When the marginal cost at “zero information acquisition” is positive, the probability of making an appropriate decision tends to be less than one.

Sustainability in the Design of an Itinerant Cultural Exhibition. Study of Two Alternatives

The sustainability improvement of museums and exhibitions is a recent concern for multiple organisations. The application of sustainability criteria is one of the most important strategies of innovation in design activities, products, and service systems. This study analyses the sustainability of two alternatives to an itinerant cultural exhibition service. The exhibition travels to 12 destinations over 3 years and is within a space of 300 m2. In the first alternative, the contents are printed and exposed on a physical medium, and in the second, audiovisual media projects the contents on the walls. Life cycle sustainability assessment is applied to evaluate the impacts in the environmental dimension and the economic and social dimensions. The calculation of indicators, such as the greenhouse gas emissions, total costs, and working time, which are referred to each sustainability dimension, is conducted. A descriptive, comparative study was performed to identify the impact factors with a higher incidence. The results demonstrate that the audiovisual exhibition is more sustainable than the printed exhibition, with a difference of 8.7%, 7%, and 6.6% in GWP100, CE, and TW indicators, respectively.

Penggerombolan Sekolah pada Penerimaan Mahasiswa Baru Jalur SNMPTN di IPB Menggunakan Metode Two-Step Cluster

New student admissions are opened in three pathways including SNMPTN, SBMPTN, and Seleksi Mandiri. In order to improve the SNMPTN selection system at IPB, a study was conducted on the quality of SMA/MA which registered to IPB through school clustering. In general, cluster analysis cannot handle large and mixed-type data, so this school clustering used the Two-Step Cluster method with two alternatives, namely without handling outliers and handling 5 percent outliers. Both of these alternatives produced an average Silhouette coefficient value of 0.2 and 0.3 respectively, which was still under the good category. However, clustering without handling outliers resulted in more detailed cluster criteria with 4 optimal clusters. The criteria for these four clusters include, Cluster 1 is a category of Low Commitment, Low Quality, and Low Consistency schools, Cluster 2 and 3 are categories of schools that have special criteria in certain categories, and Cluster 4 is a category of High Commitment, High Quality, and High Consistency.

County Over Party: How Governors Prioritized Geography Not Particularism in the Distribution of Opportunity Zones

Allocating resources is a central function of government, and the distributive politics literature provides considerable evidence of leaders around the world directing resources to co-partisan voters and officials. In the United States, studies of ‘presidential particularism’ have recently demonstrated strategic targeting by the federal executive branch. This letter extends the inquiry to states using an unusually rich case in which all governors simultaneously faced decisions about allocating a constrained resource – tax advantaged status for economic development – from an exogenously generated list of geographic possibilities. This study tests whether governors rewarded their supporters' and allies' areas alongside two alternatives: (1) spreading the wealth by geographic subunits and (2) policy need. It finds no evidence of gubernatorial particularism. Instead, Republicans and Democratic governors prioritized allocating opportunity zones geographically and made efforts to designate at least one in each county. They were also responsive to policy need.