Stress corrosion cracking of Ti-6Al-4V titanium alloy in various fluids

Stress corrosion tests of titanium alloys in fluid

What Fundamentals Drive World Migration?

OECD governments note rising immigration with alarm and grapple with policies aimed at selecting certain migrants and keeping out others. Economists appear to be well armed to advise governments since they are responsible for an impressive literature that examines the characteristics of individual immigrants, their absorption and the consequences of their migration on both sending and receiving regions. Economists are, however, much less well armed to speak to the determinants of the world migrations that give rise to public alarm. This paper offers a quantitative assessment of the economic and demographic fundamentals that have driven and are driving world migration, across different historical epochs and around the world. The paper is organized around three questions: How do the standard theories of migration perform when confronted with evidence drawn from more than a century of world migration experience? How do inequality and poverty influence world migration? Is it useful to distinguish between migration pressure and migration ex-post, or between the potential demand for visas and the actual use of them?

After Columbus: Explaining the Global Trade Boom 1500-1800

This paper documents the size and timing of the world inter-continental trade boom following the great voyages in the 1490s of Columbus, da Gama and their followers. Indeed, a trade boom followed over the subsequent three centuries. But what was its cause? The conventional wisdom in the world history literature offers globalization as the answer: it alleges that declining trade barriers, falling transport costs and overseas "discovery" explains the boom. In contrast, this paper reports the evidence that confirms unambiguously that there was no commodity price convergence between continents, something that would have emerged had globalization been a force that mattered. Thus, the trade boom must have been caused by some combination of European import demand and foreign export supply from Asia and the Americas. Furthermore, the behavior of the relative price of foreign importables in European cities should tell us which mattered most and when. We offer detailed evidence on the relative prices of such importables in European markets over the five centuries 1350-1850. We then offer a model which is used to decompose the sources of the trade boom 1500-1800.

Vanishing Third World Emigrants?

This paper documents a stylized fact: the Third World has been undergoing an emigration life cycle since the 1960s, and, except for Africa, emigration rates have been level or even declining since a peak in the late 1980s and the early 1990s. The current economic crisis will serve only to accelerate those trends. The paper estimates the economic and demographic fundamentals driving these emigration life cycles to the United States since 1970 – income and education gaps between the US and the sending country, poverty traps and the size of the cohort at risk in the sending country, and the migrant stock in the US. It then projects the life cycle up to 2024. The projections imply that pressure on Third World emigration over the next two decades will not increase, after which it will decline. It also suggests that future US immigrants will be more African and less Hispanic than in the past.Third World, emigration, development, life cycle

International Migration in the Long-Run: Positive Selection, Negative Selection and Policy

Most labor scarce overseas countries moved decisively to restrict their immigration during the first third of the 20th century. This autarchic retreat from unrestricted and even publicly-subsidized immigration in the first global century before World War I to the quotas and bans introduced afterwards was the result of a combination of factors: public hostility towards new immigrants of lower quality public assessment of the impact of those immigrants on a deteriorating labor market, political participation of those impacted, and, as a triggering mechanism, the sudden shocks to the labor market delivered by the 1890s depression, the Great War, postwar adjustment and the great depression. The paper documents the secular drift from very positive to much more negative immigrant selection which took place in the first global century after 1820 and in the second global century after 1950, and seeks explanations for it. It then explores the political economy of immigrant restriction in the past and seeks historical lessons for the present.

After Columbus: Explaining the Global Trade Boom 1500-1800

This paper documents the size and timing of the world inter-continental trade boom following the greate voyages in the 1490s of Columbus, da Gama and their followers. Indeed, a trade boom followed over the subsequent three centuries. But what was its cause? The conventionnal wisdom in the world history literature offers globalization as the answer: it alleges that declining trade barriers falling transport costs and overseas "discovery" explains the boom. In contrast, this paper reports the evidence that confirms unambiguously that there was no commodity price convergence between continents, something that would have emerged had globalization been a force that mattered. Thus, the trade boom must have been caused by some combination of European import demand and foreign export supply from Asia and the Americas. Furthermore, the behavior of the relative price of foreign importables in European cities should tell us which mattered most and when. We offer detailed evidence on the relative prices of such importables in European markets over the five centuries 1350-1850. We then offer a model which is used to decompose the sources of the trade boom 1500-1800.

What Fundamentals Drive World Migration?

migration, poverty, demographic economics, emigration, immigration

Demographic and Economic Pressure on Emigration Out of Africa

Two of the main forces driving European emigration in the late nineteenth century were real wage gaps between sending and receiving regions and demographic booms in the low-wage sending regions (directly augmenting the supply of potential movers as well as indirectly making already-measured employment conditions less attractive). These two features are even more prominent in Africa today, but do or can Africans respond to them with the same elasticity as in the days of 'free' migration? Our new estimates of net migration and labor market performance for the countries of sub-Saharan Africa suggest that exactly the same forces are at work driving African across-border migration today. Rapid growth in the cohort of young potential migrants, population pressure on the resource base, and poor economic performance are the main forces driving African migration. A century ago, more modest demographic forces in Europe were accompanied by strong catching-up economic growth in the low-wage emigrant regions, followed by a slowdown in already-modest demographic growth. Yet, migrations were still mass. In Africa today, economic growth has faltered, its economies have fallen further behind the high-wage OECD leaders, and there is a demographic speed up in the making. Our estimates suggest that the pressure on emigration out of Africa will intensify, manifested in part by a growing demand for entrance into high-wage OECD labor markets.

What Determines Immigration's Impact? Comparing Two Global Centuries

Can history shed light on the modern debate about immigration%u2019s labor market impact in high wage economies? This paper examines the relationship between migration and capital flows in the age of mass migration before 1914, the so-called first global century. It then assesses the effects of immigration on wages and employment with and without international capital mobility in first global century and today, that is, the second global century. The paper then explores the links between these economic relationships and immigration policy. It concludes with an explanation for the apparent difference in immigration%u2019s impact in the two global centuries, and thus on policy.

Refugees, Asylum Seekers and Policy in Europe

The number of refugees worldwide is now 12 million, up from 3 million in the early 1970s. And the number seeking asylum in the developed world increased tenfold, from about 50,000 per annum to half a million over the same period. Governments and international agencies have grappled with the twin problems of providing adequate humanitarian assistance in the Third World and avoiding floods of unwanted asylum seekers arriving on the doorsteps of the First World. This is an issue that is long on rhetoric, as newspaper reports testify, but surprisingly short on economic analysis. This paper draws on the recent literature, and ongoing research, to address a series of questions that are relevant to the debate. First, we examine the causes of refugee displacements and asylum flows, focusing on the effects of conflict, political upheaval and economic incentives to migrate. Second, we examine the evolution of policies towards asylum seekers and the effects of those policies, particularly in Europe. Finally, we ask whether greater international coordination could produce better outcomes for refugee-receiving countries and for the refugees themselves.