Over the last three decades, Europe''s generous social benefits have encouraged a massive surge of ''welfare migration,'' especially of low skilled laborers. At the same time, the US has attracted many highly skilled migrants, which in turn promotes internal innovation.Restrictions on the international mobility of labor are arguably the largest policy obstructions for the international economy today. A variety of studies suggest that even a small reduction in barriers to migration will result in the growth of significant global welfare benefits. Migration States and Welfare States focuses on a central tension faced by policy makers in countries that receive migrants from lower wage countries. Such countries are typically highly productive and rich in capital. These attributes, coupled with the host country''s welfare system, attract low-skilled migrants, who find a generous welfare state particularly attractive, while deterring skilled migrants, who recognize that welfare states likely have higher redistributive taxes.

Over the last three decades, Europe's generous social benefits have encouraged a massive surge of 'welfare migration,' especially of low skilled laborers. At the same time, the US has attracted many highly skilled migrants, which in turn promotes internal innovation.Restrictions on the international mobility of labor are arguably the largest policy obstructions for the international economy today. A variety of studies suggest that even a small reduction in barriers to migration will result in the growth of significant global welfare benefits. Migration States and Welfare States focuses on a central tension faced by policy makers in countries that receive migrants from lower wage countries. Such countries are typically highly productive and rich in capital. These attributes, coupled with the host country's welfare system, attract low-skilled migrants, who find a generous welfare state particularly attractive, while deterring skilled migrants, who recognize that welfare states likely have higher redistributive taxes.

During the past few decades we have witnessed an era of remarkable growth in the field of molecular biology. In 1950 very little was known of the chemical constitution of biological systems, the manner in which information was trans­ mitted from one organism to another, or the extent to which the chemical basis of life is unified. The picture today is dramatically different. We have an almost bewildering variety of information detailing many different aspects of life at the molecular level. These great advances have brought with them some breath-taking insights into the molecular mechanisms used by nature for rep­ licating, distributing and modifying biological information. We have learned a great deal about the chemical and physical nature of the macromolecular nucleic acids and proteins, and the manner in which carbohydrates, lipids and smaller molecules work together to provide the molecular setting of living sys­ tems. It might be said that these few decades have replaced a near vacuum of information with a very large surplus. It is in the context of this flood of information that this series of monographs on molecular biology has been organized. The idea is to bring together in one place, between the covers of one book, a concise assessment of the state of the subject in a well-defined field. This will enable the reader to get a sense of historical perspective-what is known about the field today-and a description of the frontiers of research where our knowledge is increasing steadily.

Over the last three decades, Europe''s generous social benefits have encouraged a massive surge of ''welfare migration,'' especially of low skilled laborers. At the same time, the US has attracted many highly skilled migrants, which in turn promotes internal innovation.Restrictions on the international mobility of labor are arguably the largest policy obstructions for the international economy today. A variety of studies suggest that even a small reduction in barriers to migration will result in the growth of significant global welfare benefits. Migration States and Welfare States focuses on a central tension faced by policy makers in countries that receive migrants from lower wage countries. Such countries are typically highly productive and rich in capital. These attributes, coupled with the host country''s welfare system, attract low-skilled migrants, who find a generous welfare state particularly attractive, while deterring skilled migrants, who recognize that welfare states likely have higher redistributive taxes.

Over the last three decades, Europe's generous social benefits have encouraged a massive surge of 'welfare migration,' especially of low skilled laborers. At the same time, the US has attracted many highly skilled migrants, which in turn promotes internal innovation.Restrictions on the international mobility of labor are arguably the largest policy obstructions for the international economy today. A variety of studies suggest that even a small reduction in barriers to migration will result in the growth of significant global welfare benefits. Migration States and Welfare States focuses on a central tension faced by policy makers in countries that receive migrants from lower wage countries. Such countries are typically highly productive and rich in capital. These attributes, coupled with the host country's welfare system, attract low-skilled migrants, who find a generous welfare state particularly attractive, while deterring skilled migrants, who recognize that welfare states likely have higher redistributive taxes.

During the past few decades we have witnessed an era of remarkable growth in the field of molecular biology. In 1950 very little was known of the chemical constitution of biological systems, the manner in which information was trans­ mitted from one organism to another, or the extent to which the chemical basis of life is unified. The picture today is dramatically different. We have an almost bewildering variety of information detailing many different aspects of life at the molecular level. These great advances have brought with them some breath-taking insights into the molecular mechanisms used by nature for rep­ licating, distributing and modifying biological information. We have learned a great deal about the chemical and physical nature of the macromolecular nucleic acids and proteins, and the manner in which carbohydrates, lipids and smaller molecules work together to provide the molecular setting of living sys­ tems. It might be said that these few decades have replaced a near vacuum of information with a very large surplus. It is in the context of this flood of information that this series of monographs on molecular biology has been organized. The idea is to bring together in one place, between the covers of one book, a concise assessment of the state of the subject in a well-defined field. This will enable the reader to get a sense of historical perspective-what is known about the field today-and a description of the frontiers of research where our knowledge is increasing steadily.