基于目标替代率的税延型商业养老保险扣除限额优化研究

我国养老保障体系三支柱发展严重失衡,为了缓解基本养老保险的压力,提升养老保险替代率,商业养老保险的发展迫在眉睫,税收递延型商业养老保险也开始试点。在2018年个税改革后,目前税收递延型商业养老保险推行办法下,中低收入群体无法享受实际税收优惠,高收入群体可享受的税收优惠有限且过低。本文以替代率为基准,根据精算平衡原理构建模型,对扣除限额进行优化研究,试图测算出与新个税办法匹配且有利于多层次收入水平的消费个体享受实际税优的扣除限额。同时,本文还对不同扣除限额下开始购买保险年龄、个税起征点、个人收益率及初始收入水平这四个参数变化对实际税优额的影响做了分析,得出所测算出的扣除限额的确较现行扣除限额更为合理,并提出了相关对策建议。     

Substitution Possibility between Unpriced Pulp and Wastepaper in the U.S. Paper and Paperboard Industry

A greater use of recycled wastepaper would preserve virgin forests as well as reducing the amount of wastepaper going to landfills. These environmental goals depend critically on the elasticity of substitution between pulp and wastepaper in producing paper and paperboard. Since most of the pulp consumed by U.S. paper mills and paperboard mills is transferred internally from vertically integrated pulp mills, the price data on pulp is not available. This paper constructs an econometric model which enables us to estimate the substitution possibility between unpriced pulp and wastepaper in the U.S. paper and paperboard industry. Empirical results show that the elasticity of substitution between unpriced pulp and wastepaper is positive, but not statistically significant.     

On a generalization of a class of production functions

In Appl. Econ. Lett. 18 (2011), 1777–1784, as a natural generalization of some famous production models with two inputs, C.A. Ioan and G. Ioan introduced a new class of production functions with constant return to scale, called sum production function, and proved three theorems of characterization for such production models. In this article, we give new and more simple proofs of these theorems, extending also the results to the case of increased/decreased return to scale. The generalization to the case of an arbitrary number of inputs is also discussed.     

How the Rapid Development of VoIP Technologies Affects Consumer Welfare and the Market

Abstract

The impact of Voice over Internet Protocol (VoIP) growth on other telecommunication services, such as landlines and mobile telephony, has gained significant interest in Korea recently. An emerging alternative to landline telecommunications, VoIP is experiencing explosive growth in demand and is providing significant economic utility to consumers. The rapid growth of smart phones has also created a considerable amount of controversy regarding the potential impact of VoIP on the mobile phone market. This study provides quantitative estimations of consumer surplus for landline, mobile and VoIP services in the Korean telecommunications market using monthly call data from January of 2006 to June of 2009, a period when VoIP services grew rapidly. Empirical analyses are conducted to estimate consumer surplus based on the demand functions of each telecommunication service. Additional analyses are conducted on consumer surplus change as well. Policy implications for the rapid growth of VoIP and its impact on consumer surplus change are also discussed.     

医疗保障与老年医疗消费的实证分析

老年人的生活质量与医疗保障密切相关.本文运用Logistics回归和两步估计样本选择模型考察了医疗保险对老人医疗消费的影响.结果显示医疗保险能增加老年人的医疗利用水平但未能减轻医疗支出水平;人口禀赋因素是影响老年人购买商业医疗保险的决定因素,并通过交互作用影响老人的消费行为;老人医疗消费的健康效应强于收入效应.在实践中应首先从制度安排上为医疗保险提供明确的政策信号其次应为商业医疗保险的发展创造有利条件;最后应为老人营造温馨的氛围,从而减少医疗消费.     

网上零售影响社会物流发展的定量分析

通过多元线性回归等方法分析,在其他因素不变情况下,发现网上零售交易规模的边际社会物流需求大于零并且呈现递减规律,网上零售市场发展可促进高效率物流对低效率物流的替代作用。     

von Thünen: Capital,Production Functions,Marginal Productivity Wages,and the Natural Wage

This paper puts seminal contributions to theory of production functions and maximization of explicit quantitative objective functions by Johann Heinrich von Thünen into a systematic historical perspective. We show that his comprehensive ‘Tableau Economiques’ do imply two exact parametric production functions. Moreover, the renowned ‘geometric mean wage’ formula is restated as an exact CES marginal labor productivity wage for σ = 2. We review four alternative modes of normative (natural) wage calculations without an explicit production function, and conclude that von Thünen's natural wage differentiation formulas are bona fide alternatives for deriving the natural wage formula.     

Intertemporal production and intertemporal substitution in output supply and input demand

This article presents an intertemporal model of production with multiple inputs to investigate substitution opportunities facing firms over time. The firm’s intertemporal profit maximization problem is characterized with the familiar cost function, and various intertemporal substitution elasticities are delineated for output supply and input demand. The absence of intertemporal substitution in production can imply production smoothing, and allowance for intertemporal substitution in labour demand reinforces the prediction of the real business cycle model. For aggregate US manufacturing, we find substantial substitution in output supply and labour demand over time due to intertemporal changes in output price and wage rates.     

Empirical Evidence on Corporate Risk‐Shifting

We study empirically whether nonfinancial firms’ behavior is consistent with systematic risk‐shifting. We compare firms’ operating risk before and after a debt issue, under the assumption that if there is any risk‐shifting it is most likely to occur right after a debt issue. We document a significant increase in firms’ operating risk, even after adjusting for industry influences. The risk‐shifting is higher for firms with no subsequent debt issues, and for firms with lower credit ratings. Other determinants are earnings volatility, size of debt issue, and whether the bond is callable.