What determines remittances – altruism or enlightened self-interest - and do remittances trigger additional migration? These two questions are examined empirically in Egypt, Turkey and Morocco for households with family members living abroad. Results show, first, that one cannot clearly...

This discussion paper resulted in an article in the <I>Annals of Regional Science</I> (2012). Volume 48, issue 2(SI), pages 501-527.<P> This paper addresses the performance of creative firms from the perspective of complex spatial systems. Based on an extensive high-dimensional database on both the...</p></i>

Accepted for publication in the <I>Journal of Development Economics</I>.<P> This paper introduces the Small World model (Watts and Strogatz, Nature, 1998) into the theory of economic growth and investigates how increasing economic integration affects firm size and efficiency, norm enforcement, and...</p></i>

This paper develops a continuous-time -continuous-place economic model of road trafficcongestion with a bottleneck, based on car-following theory. The model integrates twoarchetype congestion technologies used in the economics literature: 'static flow congestion',originating in the works of...

This discussion paper resulted in a publication in the <I>Journal of Urban Economics</I> (2004). Volume 55, pages 257-277.<P> Conventional economic wisdom suggests that congestion pricing would be an appropriate response to cope with the growing congestion levels currently experienced at many airports....</p></i>

This paper analyzes the effects of price differentiation and discrimination by a monopolistic transport operator, which sets fares in a congestible network. Using three models, with different spatial structures, we describe the operator’s optimal strategies in an unregulated market, a market...

We explore the properties of various types of public and private pricing on acongested road network with heterogeneous users and allowing for elasticdemand. Heterogeneity is represented by a continuum of values of time. Thenetwork consists of both serial and parallel links, which allows us to...

This discussion paper resulted in a chapter in (L.P. Dana (Ed.)) <I>Handbook of Research on Ethnic Minority Entrepreneurship</I>, pp. 42-60, Edward Elgar Publishing, 2007.<P> Co-ethnic employment refers to the stylised fact of many labour markets that there is an over-representation of workers of the same...</p></i>

This discussion paper has resulted in a publication in the <A href="http://aa4pq3kw5l.search.serialssolutions.com/directLink?&atitle=Economics%3A%20An%20Emerging%20Small%20World&author=Sanjeev%20Goyal%3B%20Marco%20J%20van%20der%20Leij%3B%20José%20Luis%20Moraga%2DGonzález&issn=00223808&title=The%20Journal%20of%20Political%20Economy&volume=114&issue=2&date=20060401&spage=403&id=doi:&sid=ProQ_ss&genre=article&lang=en">'Journal of Political Economy'</A>.<P>This paper examines the small world hypothesis. The first part of the paper presents empirical evidence on the evolution of a particular world: the world of journal publishing economists during the period...</p></a>

We present a multi-country theory of economic growth in which countries are connected by a network of mutual knowledge exchange. Growth is generated through human capital accumulation and knowledge externalities. The available knowledge in any country depends on its connections to the rest of...