Demographic shocks and global factor flows: discussion

In this intriguing paper, Jeffrey Williamson emphasizes that changes in the age distribution of the population (especially the share of young adults, the dependency ratio, and the like) are often much more important than changes in population growth rates in explaining the magnitude and direction of global factor flows. He also stresses that the transition period that follows a demographic change (such as lower fertility or lower mortality) is usually very long: a century or even longer.Demography ; Economic conditions

Virtual viewpoint three-dimensional panorama

Conventional panoramic images are known to provide for an enhanced field of view in which the scene always has a fixed appearance. The idea presented in this paper focuses on the use of the concept of virtual viewpoint creation to generate different panoramic images of the same scene with three-dimensional component. Three-dimensional effect in a resultant panorama is realized by superimposing a stereo-pair of panoramic images

Disparity map generation based on trapezoidal camera architecture for multiview video

Visual content acquisition is a strategic functional block of any visual system. Despite its wide possibilities, the arrangement of cameras for the acquisition of good quality visual content for use in multi-view video remains a huge challenge. This paper presents the mathematical description of trapezoidal camera architecture and relationships which facilitate the determination of camera position for visual content acquisition in multi-view video, and depth map generation. The strong point of Trapezoidal Camera Architecture is that it allows for adaptive camera topology by which points within the scene, especially the occluded ones can be optically and geometrically viewed from several different viewpoints either on the edge of the trapezoid or inside it. The concept of maximum independent set, trapezoid characteristics, and the fact that the positions of cameras (with the exception of few) differ in their vertical coordinate description could very well be used to address the issue of occlusion which continues to be a major problem in computer vision with regards to the generation of depth map

Robust Adaptive Intra Refresh for Multiview Video

Transmission error propagation in wireless multimedia communication systems has become a recurring problem. This persistent problem has led to grave consequences on the visual quality of the decoded video. It is against this backdrop that, we present an adaptive intra refresh (AIR) error-resilient coding tool to mitigate the effect of transmission error propagation in 3D video communications. This work utilizes periodic insertion of intra macroblocks in badly error-infected frames temporally as well as related frames in the multi view video scheme. Our objective is to maximize the transmission efficiency while ensuring the transmission robustness of the coded bitstream. The selection of periodic macroblocks is based on areas with high motion above a pre-set threshold. The coding modes of the macroblocks are based on the distortion expectation due to transmission errors. Extensive simulation results show significant improvement in both objective and subjective video quality at different intra refresh rates

Welfare Migration: Is the Net Fiscal Burden a Good Measure of Its Economic Impact on the Welfare of the Native Born Population?

Migration of young workers (as distinct from retirees), even when driven in by the generosity of the welfare state, slows down the trend of increasing dependency ratio. But, even though low-skill migration improves the dependency ratio, it nevertheless burdens the welfare state. Recent studies by Smith and Edmonston (1977), and Sinn et al (2003) comprehensively estimate the fiscal burden that low-skill migration imposes on the fiscal system. However an important message of this paper is that in an infinite-horizon set-up, one cannot fully grasp the implications of migration for the welfare state, just by looking at the net fiscal burden that migrants impose on the fiscal system. In an infinite-horizon, overlapping generations economy, this net burden, could change to net gain to the native born population.

Gains from FDI Inflows with Incomplete Information

The paper develops an international macroeconomic model of FDI flows with a unique feature: a hands-on management ability to react in real time to changing economic environments. Anticipating this advantage, foreign direct investors can outbid other investors in a certain industry in which they specialize in the source country. The model can explain both two-way FDI flows among developed countries and one-way FDI flows from developed to developing country. The unique gains from FDI to the host country stem from the increased eciency of domestic investment.

Resisting Migration: The Problems of Wage Rigidity and the Social Burden

Just like any trade activity in well-functioning markets, migration tends to enhance the efficiency of the allocation of resources. With non-distortionary income distribution policy instruments which can compensate losers, migration generates income gains. But the gains tend to be typically rather small. However, when the labor market is malfunctioning and wages are rigid, migration exacerbates imperfections in the market. Consequently, it may lead to losses to the established population which can be quite sizable. Another problem raised by migration is the toll it imposes on the welfare state. Being unable to perfectly exclude migrants from various entitlement programs and public services, the modern welfare state finds it more and more costly to run its various programs. These two economic considerations may help explain why there is strong resistance to migration. Consequently, improvements in functioning of the labor markets (with a possible compensation to wage earners that compete with unskilled migrants) and more selectivity in the scope of and the eligibility for the state entitlement programs may potentially ease, to a large extent, the resistance to migration from the established population.

Aging and the Welfare State: The Role of Young and Old Voting Pivots

An income tax is generally levied on both capital and labor income. The working young bears mostly the burden of the tax on labor income, whereas the retired old, who already acummulated her savings, bears the brunt of the capital income tax. Therefore, there arise two types of conflict in the determination of the income tax: the standard intragenerational conflict between the poor and the rich, and an ntergenerational conflict between the young and the old. The paper studies how aging affects the resolution of these conflicts, and the politico-economic forces that are at play: the changes in the voting pivots and the fiscal leakage from tax payers to transfer recipients.

On the Desirability of Taxing Charitable Contributions

We develop a model that allows for public goods and status signaling through charitable contributions. This model provides a unified framework in which contributions are driven both by altruism and status signaling. We use this setup to re-examine the conventional practice of rendering a favorable tax treatment to charitable contributions.optimal taxation, re-distribution, charitable contributions, inequality

Welfare Migration: Is the Net Fiscal Burden a Good Measure of its Economics Impact on the Welfare of the Native-Born Population?

Migration of young workers (as distinct from retirees), even when driven in by the generosity of the welfare state, slows down the trend of increasing dependency ratio. But, even though low-skill migration improves the dependency ratio, it nevertheless burdens the welfare state. Recent studies by Smith and Edmonston (1977), and Sinn et al (2003) comprehensively estimate the fiscal burden that low-skill migration imposes on the fiscal system. However, an important message of this paper is that in an infinite-horizon set-up, one cannot fully grasp the implications of migration for the welfare state just by looking at the net fiscal burden that migrants impose on the fiscal system. In an infinite-horizon, overlapping generations economy, this net burden could change to net gain to the native-born population.migration, welfare state, fiscal burden