Simple Estimators for Invertible Index Models

This article considers estimation of the unknown linear index coefficients of a model in which a number of nonparametrically identified reduced form parameters are assumed to be smooth and invertible function of one or more linear indices. The results extend the previous literature by allowing the number of reduced form parameters to exceed the number of indices (i.e., the indices are “overdetermined” by the reduced form parameters. The estimator of the unknown index coefficients (up to scale) is the eigenvector of a matrix (defined in terms of a first-step nonparametric estimator of the reduced form parameters) corresponding to its smallest (in magnitude) eigenvalue. Under suitable conditions, the proposed estimator is shown to be root-n-consistent and asymptotically normal, and under additional restrictions an efficient choice of a “weight matrix” is derived in the overdetermined case.     

Transforming Korea into a multicultural society: reception of multiculturalism discourse and its discursive disposition in Korea

Since 2005, multicultural-based words such as multicultural society, multicultural family, and multicultural education have grown explosively in Korean society. Due to this social trend, adoption of the term multiculturalism has become a trend within the government and press to explain current social changes in Korea. Nevertheless, there have been few efforts to tackle multiculturalism as a crucial political project or a considerable academic theme of discussion. Thus, this study aims to examine how multiculturalism discourse in Korea has been received and draws its discursive disposition. It argues how the media, especially the press, incorporate other crucial issues such as ‘diversity’, ‘human rights’, and ‘minority politics’ in terms of multiculturalism. To analyse, a total of 275 journal articles were selected and scrutinised. This study contextualises Korean multiculturalism and suggests a meta-picture of the discursive economy of multiculturalism in Korea.     

CAPACITY CONSTRAINED EXPORTERS: IDENTIFYING INCREASING MARGINAL COST

This study revisits a central assumption of standard trade models: constant marginal cost technology. The presence of increasing marginal costs for exporters introduces significant market interdependence across borders missing from traditional models of international trade that rely on constant marginal cost technology. Such market interdependence represents an additional channel through which local shocks are transmitted globally. To identify increasing marginal cost at the level of the firm, we build in flexible production assumptions that nest increasing, decreasing, and constant marginal cost technology to an otherwise standard international trade model. We derive an estimating equation that can be taken directly to the data. Our structural equation explicitly guides our inference on the shape of the marginal cost curve from estimated coefficients. The results suggest that increasing marginal cost is predominant at the firm level. Moreover, utilizing plant‐level information on physical and financial capacity constraints, we find that the degree of increasing marginal cost is significantly exacerbated by both types of constraints. The evidence suggests that access to larger markets through greater international integration may not have the expected welfare gains typically predicted in standard models. (JEL F12, F14)     

Social investment,social service and the economic performance of welfare states

This article begins with an examination of the role of social services as the key instrument of social investment strategy, presenting an empirical analysis of its impact on economic performance. A pooled time series, cross‐section analysis was conducted with the data of 15 welfare states from 1990 to 2007 under the ‘social investment hypothesis’ that more social service orientedness brings about a greater positive effect on the economy. The results show that a larger share of social service spending in the total social expenditure – more social service orientedness – contributes to economic growth and labour market performance, whereas a larger aggregate size of the welfare state may have a negative effect on employment. In conclusion, this study suggests that the relatively ambiguous welfare strategy of social investment could be clarified as a ‘transition from income security to livelihood security’ in which emphasis is placed on social service. Key Practitioner Message: ● This study suggests that the key instrument of social investment strategy is social service; ● The results show that more social service orientedness contributes to economic growth and labour market performance.     

Recent books on HRD

Abstract

The growing potential and need for knowledge and information have had a profound impact on Korea as it strives to develop strategies for national human resource development (NHRD). Within Korea, one strategy for developing NHRD is through regional efforts. However, there is little research regarding regional HRD (RHRD), in spite of the importance of such a focus. This article explores directions and policy-making strategies for RHRD in Busan. 1 1 Busan is often written as Pusan in English, though Busan is preferred in Korea.      

Preference for Flexibility and Random Choice

We study a two‐stage model where the agent has preferences over menus as in Dekel, Lipman, and Rustichini (2001) in the first period and then makes random choices from menus as in Gul and Pesendorfer (2006) in the second period. Both preference for flexibility in the first period and strictly random choices in the second period can be, respectively, rationalized by subjective state spaces. Our main result characterizes the representation where the two state spaces align, so the agent correctly anticipates her future choices. The joint representation uniquely identifies probabilities over subjective states and magnitudes of utilities across states. We also characterize when the agent completely overlooks some subjective states that realize at the point of choice.     

A quadratically convergent algorithm for first passage time distributions in the Markov-modulated Brownian motion

A Markov-modulated Brownian motion (MMBM) is a substantial generalization of the classical Brownian Motion and is obtained by allowing the Brownian parameters to be modulated by an underlying Markov chain of environments. As with Brownian Motion, the time-dependent analysis of the MMBM becomes easy once the first passage times between levels are determined. However, in the MMBM those distributions cannot be obtained explicitly, and we need efficient algorithms to compute them. In this article, we provide a powerful approach based on approximating the MMBM with a sequence of scaled Markov-modulated fluid flows without Brownian components that weakly converge to the MMBM. Our main result is a Riccati equation for an associated matrix of transforms that satisfies conditions for the Newton scheme to have quadratic convergence and thus yields a very practical tool. The solution of that Riccati equation determines needed first passage times in the MMBM without much additional work. The success of our approach, which is based essentially on first-order fluid flows and a stochastic limit process, is argued to be due to the way we have isolated certain terms involving the quadratic variation effects of the Brownian. As an illustration of our algorithm, we present a numerical example of time-dependent results for a MMBM considered by Asmussen for which he determined (only) the eventual first return probabilities which we use here as an accuracy check.