The random growth of interfaces as a subordinated process

We study the random growth of surfaces from within the perspective of a single column, namely, the fluctuation of the column height around the mean value, y(t)= h(t)-, which is depicted as being subordinated to a standard fluctuation-dissipation process with friction gamma. We argue that the main properties of Kardar-Parisi-Zhang theory, in one dimension, are derived by identifying the distribution of return times to y(0) = 0, which is a truncated inverse power law, with the distribution of subordination times. The agreement of the theoretical prediction with the numerical treatment of the 1 + 1 dimensional model of ballistic deposition is remarkably good, in spite of the finite size effects affecting this model.Comment: LaTeX, 4 pages, 3 figure

Burden sharing in deficit countries: a questionnaire-experimental investigation

This paper studies the problem of burden sharing in countries that were forced to introduce severe budget cuts after the collapse of Lehman Brothers in 2008 which had unleashed a financial crisis in many industrialised countries of the Western world. We do not ask how the burden was actually split in each country examined but how the burden should have been shared among different income groups of society. In order to answer this question, a questionnaire-experimental investigation was run among students from Cyprus, Greece, Ireland, Italy, Portugal, and Spain. Our study offered the students seven different schemes of taxation amongst which we had specified a proportional rule and two progressive schemes of differing severity. A key result within our investigation is the finding that a large majority of students in all countries involved rarely opted for a proportional rule of burden sharing but picked one of the two progressive schemes instead. However, there were differences between countries with respect to the frequencies of these three rules, whereby Greece and Ireland were polar cases. The other rules received only minor support

An Experimental Game of Loss Sharing

We conduct a lab-experimental study of bargaining over the distribution of monetary losses. Groups of four differently endowed participants must agree, as a group, on the contribution each participant will make to cover a financial loss imposed on the group. The study sheds light on burden sharing and what loss allocation rules groups adopt. Furthermore, we characterize a new theoretical model which contains the proportional rule and equality of losses as special cases but collides with the constrained equal awards rule. The combination of our model and the constrained equal awards rule can explain the majority of proposals made in our experiment

Cooperatives in the social and solidarity economy: Sustainable development and decent work in Africa’s informal economy

How can the contribution of cooperatives and the wider social and solidarity economy (SSE) to global development frameworks (the Sustainable Development Goals (SDGs) and the Decent Work Agenda (DWA) be made more effective, impactful and visible, in particular with regard the informal economy in sub-Saharan Africa? This thesis seeks to provide an answer to this question through the journey of my professional practice, bridging the gap to academic theory. The thesis critically analyses and builds upon the contributions to knowledge of my portfolio of seven ‘professional practice’ papers published between 1993 and 2020. The papers were written upon request or invitation by the International Labour Organization (ILO), the UN Department for Economic and Social Affairs, the Plunkett Foundation, and the Friedrich-Ebert Foundation. The thesis starts with a contextual overview of the state of the field from both practice and theory. This is followed by a literature review which examines academic theory in relation to, and interaction between, the five focus areas of my thesis (cooperatives, SSE, DWA, SDGs, informal economy) within the context of neoliberal policies in Africa. I then critically reflect on the methodological, theoretical and political aspects of my seven publications. Finally, I pin-point directions for future research. I conclude that the SSE’s potential to contribute to sustainable development and decent work in Africa is far from being fully harnessed, for the reason that most policy-makers, researchers and practitioners lack cognizance of the existence and agency of member-based organizations that constitute the SSE. Through the journey of writing the theses I have developed a conceptual model and an accompanying tool to systematically identify and evaluate the synergies and complementarities between the four dimensions of sustainable development (economic, social, environmental and institutional), the four pillars of decent work (jobs, protection, dialogue, rights), and the four functions of the SSE (economic opportunities, social security, societal empowerment, environmental protection). This then helps to identify SSE-pertinent SDG targets, and to determine which types of organizations in the SSE are best suited to contribute to specific SDG targets. I consider this conceptual model and its accompanying tool as an original contribution to knowledge of theoretical and practical applicability

An Alternative to Regulation: The Case for Public AI

Can governments build AI? In this paper, we describe an ongoing effort to develop ``public AI'' -- publicly accessible AI models funded, provisioned, and governed by governments or other public bodies. Public AI presents both an alternative and a complement to standard regulatory approaches to AI, but it also suggests new technical and policy challenges. We present a roadmap for how the ML research community can help shape this initiative and support its implementation, and how public AI can complement other responsible AI initiatives.Comment: To be presented at Regulatable ML @ NeurIPS2023 worksho