Ricardian equivalence for sub-national states

The authors test Ricardian equivalence within an endogenous growth model for U.S. states, which have high rates of migration relative to most countries. Results are consistent with both Ricardian equivalence and endogenous growth, despite the relative ease of migration. Increases in productive government expenditures increase long-run real growth by the same amount, for example, whether financed by taxes or bonds. State rules limiting the use of bond financing may play a role in supporting Ricardian equivalence. The study provides the first explicit test of Ricardian equivalence for sub-national states in the context of an endogenous growth model.endogenous growth

Assessing Socioeconomic Impacts of Transport Infrastructure Projects in the Greater Mekong Subregion

This study attempts to quantify the links between infrastructure investment and poverty reduction using a multi-region general equilibrium model, supplemented with household survey data for the Greater Mekong Subregion (GMS). Infrastructure investment is an important step in economic development, with improvements in transportation infrastructure boosting economic opportunities throughout the region, for example by significantly reducing travel times and costs. In this study, we concentrate on quantifying the effects of some of the key linkages between upgraded infrastructure, economic growth, and poverty reduction. We model the impact of both reducing transport costs and improving trade facilitation in the GMS. Our findings suggest strong gains to the GMS countries as a result of infrastructure development and trade facilitation with national poverty reduced throughout the region. However, the impact on various segments of these populations differs, depending in part on factor returns.greater mekong subregion; poverty reduction; infrastructure investment

An Economist’s Guide to Heaven

This paper is the first to offer an economic model of God and humanity as optimizing agents in the context of concrete belief archetypes (religious ‘contracts’) in Judeo-Christian theology. Data support the model’s unique predictions, despite their otherwise counterintuitive, unlikely nature. For example, the model requires that in one belief archetype, ‘good works’ not increase with strength of faith, as one might otherwise expect, and that what appears may be God’s dominant contract precisely balances divine penalties for reneging on promises with incentives to seek divine ‘gifts’—an equivalence supported in the data.economics;religion

The rising share of nonmarital births: A response to Ermisch, Martin, and Wu

We are flattered that our recent paper in Demography, GSS (2006), has attracted such close attention from Ermisch Martin and Wu (EMW). In this response we appreciate the opportunity to expand on several key aspects of our paper, but see no reason to substantially revise any of our major conclusions based on EMW comments. Reading EMW, one might think we had proposed the demographic equivalent of Newton’s second law of thermodynamics – the existence of a universal phenomenon, manifest in identical form in all places, for all groups, during all times periods, regardless of circumstances. It will be helpful, then, to review briefly the central points in GSS before turning to the major EMW comments, along with our responses.fertility, illegitimacy ratio, marriage, nonmarital fertility ratio, nonmarital births

Exploring students’ use of the social networking site WhatsApp to foster connectedness in the online learning experience

In recent years, increasing attention has been paid to the use of social networking tools in higher education teaching and learning. Drawing on data from a larger study focusing on student engagement in the online virtual classroom, this paper is based on research conducted with three separate cohorts of students from the Masters in Special Educational Needs (MSEN) at St. Patrick’s College now the Institute of Education, Dublin City University (DCU). Emerging from the first two phases of the research was the use of the WhatsApp social media tool by students as an informal learning space and a means of building connectedness. We explored this finding in more detail in phases three and four by inviting respondents to comment specifically on their use of social media throughout the programme. It emerged that the use of WhatsApp was widespread, offering students an opportunity to forge a sense of connection and the basis for developing a learning community. This paper will present findings around the use of WhatsApp with reference to literature in three areas connected to the online learning experience: online learning as a second class learning experience, fostering connectedness within online learning contexts and social media and learnin

Effects of scaling task constraints on emergent behaviours in children's racquet sports performance

Manipulating task constraints by scaling key features like space and equipment is proposed as an effective method for enhancing development and refinement of movement patterns in sport. Despite this, it is currently unclear whether scaled manipulation of task constraints would impact emergent movement behaviours in young children, affording learners opportunities to develop functional movement behaviours. Here, we sought to investigate how scaling task constraints during 8-weeks of mini tennis training shaped emergent movement behaviours, such a backhand stroke development. Two groups, control (n = 8, age = 7.2 ± 0.6 years) and experimental (n = 8, age 7.4 ± 0.4 years), underwent practice using constraints-based manipulations, with more specific affordances for backhand strokes designed for the latter group. To evaluate intervention effects, pre- and post-test match-play characteristics (e.g. forehand and backhand percentages) and measures from a tennis-specific skills test (e.g. forehand and backhand technical proficiency) were examined. Post intervention, the experimental group performed a greater percentage of backhands out of total number of shots played (46.7 ± 3.3%), and a significantly greater percentage of backhand winners out of total backhand strokes observed (5.5 ± 3.0%), compared to the control group during match-play (backhands = 22.4 ± 6.5%; backhand winners = 1.0 ± 3.6%). The experimental group also demonstrated improvements in forehand and backhand technical proficiency and the ability to maintain a rally with a coach, compared to the control group. In conclusion, scaled manipulations implemented here elicited more functional performance behaviours than standard Mini Tennis Red constraints, suggesting how human movement scientists may scale task constraint manipulations to augment young athletes' performance development. Keywords: Scaling task constraints, intervention, tennis, affordances, emergent behaviour

Effects of Lawn Tennis Association mini tennis as task constraints on children’s match-play characteristics

The Lawn Tennis Association’s (LTA) Mini Tennis (MT) is a modified version of tennis consisting of progressive stages, however, there have been few attempts to evaluate how MT might shape performance behaviours. Here, we examine effects of playing MT on the emergence of children’s match-play behaviours in forty-eight junior tennis players. Performance in 1010 match-play points were filmed and coded across four tennis stages (MT Red, MT Orange, MT Green and Full Ball), using a notational analysis system. Recorded performance variables included rally length, first serve percentage and shot type, for the purpose of analysing inter-stage comparisons. Results showed a series of specific adaptations to playing characteristics across the stages, including rally length, shot variety and serve success. MT Red rallies (7.36 ± 6.06) were longer than Full Ball rallies (3.83 ± 2.40), and a higher percentage of forehands were played at MT Red (66.40% ± 8.49%) than at Full Ball stage (45.96% ± 6.47%). Findings suggested that MT stages can afford children more opportunities to develop their skills and elicit different match-play characteristics than Full Ball task constraints. Coaches, therefore, should consider the nature of emergent adaptations when designing practice environments to facilitate learning in young tennis players. Key Words: Mini Tennis, task constraints, representative learning design, adaptations, emergent behaviour

A simple new method for identifying performance characteristics associated with success in elite tennis

Performance analysis and identifying performance characteristics associated with success are of great importance to players and coaches in any sport. However, while large amounts of data are available within elite tennis, very few players employ an analyst or attempt to exploit the data to enhance their performance; this is partly attributable to the considerable time and complex techniques required to interpret these large datasets. Using data from the 2016 and 2017 French Open tournaments, we tested the agreement between the results of a simple new method for identifying important performance characteristics (the Percentage of matches in which the Winner Outscored the Loser, PWOL) and the results of two standard statistical methods, to establish the validity of the simple method. Spearman’s rank-order correlations between the results of the three methods demonstrated excellent agreement, with all methods identifying the same three performance characteristics (points won of 0-4 rally length, baseline points won and first serve points won) as strongly associated with success. Consequently, we propose that the PWOL method is valid for identifying performance characteristics associated with success in tennis, and is therefore a suitable alternative to more complex statistical methods, as it is simpler to calculate, interpret and contextualise