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Population aging, immigration policies, and the social security system in Germany.

机译:德国的人口老龄化,移民政策和社会保障体系。

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This thesis provides a dynamic general equilibrium framework to analyze the effects of alternative immigration policies on individual welfare, government finance, and the evolution of population in Germany. I construct heterogeneous agent overlapping generations models with agents differing in age, origin (immigrant or native), and working ability. An exogenous immigration policy determines the proportion of immigrants of each age and skill level as a fixed percentage of the population. Calibrating the model to the German economy, I take into account differences in inter-generational transmission of working ability, fertility, tax payments, and transfer receipts between immigrants and German natives.; The first essay documents the data sources used for the calibration of a rich set of parameters in this thesis, their availability and accessibility. It also provides detailed calculations of fertility, labor productivity, and skill transferability from parents to children.; The second essay quantifies the impacts of immigration policy changes on the evolution of population, public expenditures and receipts, and welfare along the transition to the new balanced growth path. Government transfers per person are endogenously determined. They are equilibrium objects that balance the period-by-period government budget constraint. Income and payroll taxes are modeled as average flat-rate taxes. Experiments show that a higher inflow of low-skilled old immigrants leads to a negligible increase in welfare for natives. However, letting-in only high-skilled young immigrants increases welfare by 1.9 and 1.7 percent for low- and high-skilled natives, respectively.; The third essay provides an extension of the previous model by incorporating the main features of the German social security and tax systems. Here the consumption tax adjusts to balance the government budget. I find that in an economy where pension benefits are indexed to past wages, an increase in immigrant inflow may decrease welfare through the negative impact of declining wages on pensions. However, sufficiently big inflow of high-skilled immigrants (0.8 percent of the population per year) can increase the consumption of retirees by causing a high-enough rise in the return to savings that dominates the decline in pension benefits.
机译:本文提供了一个动态的一般均衡框架,以分析替代性移民政策对德国个人福利,政府财政和人口演变的影响。我用年龄,出身(移民或本地)和工作能力不同的代理人构建了异质代理人重叠世代模型。外来移民政策确定每个年龄和技能水平的移民所占比例为人口的固定百分比。为了适应德国经济的模型,我考虑了移民与德国人之间的代际工作能力,生育率,税金以及转移收入之间的差异。第一篇论文记录了本文中用于校准一组丰富参数的数据源,它们的可用性和可访问性。它还提供了详细的计算,包括生育率,劳动生产率以及从父母到孩子的技能转移能力。第二篇文章量化了移民政策变化对向新的平衡增长路径过渡过程中人口,公共支出和收入以及福利演变的影响。每人的政府转移由内生决定。它们是平衡对象,用于平衡每个时期的政府预算约束。所得税和工资税被建模为平均统一税率。实验表明,低技能的老移民大量涌入,对当地居民的福利增长微不足道。但是,只允许高技能的年轻移民分别为低技能和高技能的原住民增加了1.9%和1.7%的福利。第三篇文章结合了德国社会保障和税收制度的主要特征,对以前的模型进行了扩展。在这里,消费税会进行调整以平衡政府预算。我发现在一个以退休金与过去的工资挂钩的经济体系中,移民工资的增加可能会因工资下降对退休金的负面影响而减少福利。但是,高技能移民的大量流入(每年占人口的0.8%)可以通过导致储蓄回报率的大幅提高(主要是养老金福利的下降)来增加退休人员的消费。

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