Economics Commons^™

Attitudes, Behaviours, And The Well-Being Of Older Singaporeans In The Time Of Covid-19: Perspectives From The Singapore Life Panel, Paulin T. Straughan, William Tov, Seonghoon Kim, Terence Cheng, Stephen Hoskins, Micah Tan

ROSA Research Briefs

COVID-19 has affected all Singaporeans, regardless of age and socioeconomic status (SES). Many measures have been implemented by the government to control the spread of this disease, including restrictions on social gatherings, restrictions on overseas travel, and making it compulsory to wear a mask. Measures have also included a partial lockdown – known as the ‘circuit breaker’ – which began in April 2020. This forced Singaporeans to quickly adapt to a new normal with some doing better than others. This research brief provides an overview of how COVID-19 and its related measures have affected seniors in Singapore using data from …

Spatial Panel Data Models With Temporal Heterogeneity, Yuhong Xu

Dissertations and Theses Collection (Open Access)

This dissertation studies the fixed effects (FE) spatial panel data (SPD) models with temporal heterogeneity (TH), where the regression coefficients and spatial coefficients are allowed to change with time. The FE-SPD model with time-varying coefficients renders the usual transformation method in dealing with the fixed effects inapplicable, and an adjusted quasi score (AQS) method is proposed, which adjusts the concentrated quasi score function with the fixed effects being concentrated out. AQS tests for the lack of temporal heterogeneity (TH) in slope and spatial parameters are first proposed. Then, a set of AQS estimation and inference methods for the FE-SPD model …

Three Essays On International Economics: Global Value Chains Of Singapore And The Cptpp; The Effects Of Oil Price Shocks On Trade, Tran Bao Phuong Nguyen

Dissertations and Theses Collection (Open Access)

This dissertation discusses two questions in international economics. The first two chapters focus on the matter of global value chains. We first explore the participation of Singapore in the global value chains by characterizing the position of Singapore in the global network and identifying Singapore’s key upstream and downstream trade partners. This is done at both the country aggregate and at the sector level. We trace how the country’s position in global value chains has changed in the past two decades: whether it has moved upstream or downstream, how involved it is in global value chains, how its trend compares …

Essays On Multivariate Stochastic Volatility Models, Han Chen

Dissertations and Theses Collection (Open Access)

In this dissertation, I have made several contributions to the literature on the multivariate stochastic volatility model. First, I have considered a new multivariate stochastic volatility (MSV) model based on a recently proposed novel parameterization of the correlation matrix. This modeling design is a generalization of Fisher's z-transformation to the high-dimensional case. It is fully flexible as the validity of the resulting correlation matrix is guaranteed automatically. It allows me to completely separate the driving factors of volatilities and correlations. To conduct an econometric analysis of the proposed model, I develop a new Bayesian method that relies on the Markov …

Three Essays On Econometrics, Xin Zheng

Dissertations and Theses Collection (Open Access)

The dissertation includes three chapters on econometrics. The first chapter is about treatment effects and its application in randomized control trial. The second chapter is about specification test. The third chapter is about panel data model with fixed effects.

In the first chapter, we study the estimation and inference of the quantile treatment effect under covariate-adaptive randomization. We propose two estimation methods: (1) the simple quantile regression and (2) the inverse propensity score weighted quantile regression. For the two estimators, we derive their asymptotic distributions uniformly over a compact set of quantile indexes, and show that, when the treatment assignment …

Individuals Responses To Economic Cycles: Organizational Relevance And A Multilevel Theoretical Integration, Nina Sirola

Research Collection Lee Kong Chian School Of Business

The state of the economy represents a concern for individuals and shapes their behavior in profound ways. The current review of studies on how individuals respond to economic cycles reveals that organizational relevance of such responses has often not been considered, and the literature is characterized by a variety of seemingly disconnected explanations for how and why individuals respond to the perceived state of the economy. I develop a theoretical framework that systematizes the literature and accounts for the seemingly disparate findings, highlighting the underlying functionality of such responses for individuals. I then integrate the literature on individual responses to …

The Promises And Perils Of Insurtech, Lin Lin, Christopher C. H. Chen

Research Collection Yong Pung How School Of Law

The insurance sector, in riding the wave of the FinTech phenomenon, has been rapidly expanding, with a slew of firms having emerged to provide so-called “InsurTech” services. These services incorporate concepts such as blockchain, artificial intelligence, digitalisation and the sharing economy to various aspects of the insurance industry. This profusion of technology brings with it the promise of various benefits including increasing efficiency and lowering costs for not only insurers and intermediaries, but also businesses or consumers as end-users of insurance. However, the development of InsurTech comes with corresponding risks and regulatory concerns not currently accounted for by the traditional …

Job Duration And Match Characteristics Over The Business Cycle, Ismail Baydur, Toshihiko Mukoyama

Research Collection School Of Economics

This paper studies the cyclical behavior of job separation and the characteristics of matches between workers and jobs. We estimate a proportional hazard model with competing risks, distinguishing between different types of separations. A higher unemployment rate at the start of an employment relationship increases the probability of job-to-job transitions, whereas its effect on employment-to-unemployment transitions is negative. We then build a simple job ladder model to interpret our empirical results. A model with two-dimensional heterogeneity in match (job) characteristics has the same qualitative features as the data. Once the model is extended to include cyclicality in the offered match …

Forecasting Singapore Gdp Using The Spf Data, Tian Xie, Jun Yu

Research Collection School Of Economics

In this article, we use econometric methods, machine learning methods, and a hybrid method to forecast the GDP growth rate in Singapore based on the Survey of Professional Forecasters (SPF). We compare the performance of these methods with the sample median used by the Monetary Authority of Singapore (MAS). It is shown that the relationship between the actual GDP growth rates and the forecasts from individual professionals is highly nonlinear and non-additive, making it hard for all linear methods and the sample median to perform well. It is found that the hybrid method performs the best, reducing the mean squared …

Redundancy Insurance Is Not Unemployment Insurance, Zhengxiao Wu

Research Collection School Of Economics

In a commentary, SMU Senior Lecturer of Statistics Wu Zhengxiao discussed the difference between redundancy insurance and unemployment insurance. He shared Japan's example, where the cost for unemployment insurance is higher than redundancy insurance, and added that being an unprecedented policy, more care should be taken when implementing it.

In-Fill Asymptotic Theory For Structural Break Point In Autoregressions, Liang Jiang, Xiaohu Wang, Jun Yu

Research Collection School Of Economics

This article obtains the exact distribution of the maximum likelihood estimator of structural break point in the Ornstein-Uhlenbeck process when a continuous record is available. The exact distribution is asymmetric, tri-modal, dependent on the initial condition. These three properties are also found in the finite sample distribution of the least squares (LS) estimator of structural break point in autoregressive (AR) models. Motivated by these observations, the article then develops an in-fill asymptotic theory for the LS estimator of structural break point in the AR(1) coefficient. The in-fill asymptotic distribution is also asymmetric, tri-modal, dependent on the initial condition, and delivers …

Evaluating Human Versus Machine Learning Performance In Classifying Research Abstracts, Yeow Chong Goh, Xin Qing Cai, Walter Theseira, Giovanni Ko, Khiam Aik Khor

Research Collection School Of Economics

We study whether humans or machine learning (ML) classification models are better at classifying scientific research abstracts according to a fixed set of discipline groups. We recruit both undergraduate and postgraduate assistants for this task in separate stages, and compare their performance against the support vectors machine ML algorithm at classifying European Research Council Starting Grant project abstracts to their actual evaluation panels, which are organised by discipline groups. On average, ML is more accurate than human classifiers, across a variety of training and test datasets, and across evaluation panels. ML classifiers trained on different training sets are also more …

Globalization And Top Income Shares, Lin Ma, Dimitrije Ruzic

Research Collection School Of Economics

This paper documents empirically that access to global markets is associated with a higher executive-to-worker pay ratio within the firm. It then uses China's 2001 accession to the World Trade Organization as a trade shock to show that firms that exported to China prior to 2001 subsequently exported more, grew larger, and grew more unequal in terms of executive-to-worker pay. To evaluate analytically and quantitatively the impacts of globalization on top income inequality, this paper builds a model with heterogeneous firms, occupational choice, and executive compensation. In the model, executive compensation grows with the size of the firm, while the …

Realized Semicovariances, Tim Bollerslev, Jia Li, Andrew J. Patton, Rogier Quaedvlieg

Research Collection School Of Economics

We propose a decomposition of the realized covariance matrix into components based on the signs of the underlying high-frequency returns, and we derive the asymptotic properties of the resulting realized semicovariance measures as the sampling interval goes to zero. The first-order asymptotic results highlight how the same-sign and mixed-sign components load differently on economic information related to stochastic correlation and jumps. The second-order asymptotic results reveal the structure underlying the same-sign semicovariances, as manifested in the form of co-drifting and dynamic “leverage” effects. In line with this anatomy, we use data on a large cross-section of individual stocks to empirically …

Two Suggestions To Wp Mp Jamus Lim, Zhengxiao Wu

Research Collection School Of Economics

In a commentary, SMU Senior Lecturer of Statistics Wu Zhengxiao discussed the arguments presented by Workers’ Party’s candidate Associate Professor Jamus Lim during the live broadcast of a political debate, and put forth two suggestions for Assoc Prof Lim.

Quantile Treatment Effects And Bootstrap Inference Under Covariate-Adaptive Randomization, Yichong Zhang, Xin Zheng

Research Collection School Of Economics

In this paper, we study the estimation and inference of the quantile treatment effect under covariate‐adaptive randomization. We propose two estimation methods: (1) the simple quantile regression and (2) the inverse propensity score weighted quantile regression. For the two estimators, we derive their asymptotic distributions uniformly over a compact set of quantile indexes, and show that, when the treatment assignment rule does not achieve strong balance, the inverse propensity score weighted estimator has a smaller asymptotic variance than the simple quantile regression estimator. For the inference of method (1), we show that the Wald test using a weighted bootstrap standard …

4 Lessons In Digital Transformation From The Lucrative K-Pop Industry, Singapore Management University

Perspectives@SMU

K-pop is set to become one of the most lucrative industries in the world thanks to digital transformation, and this provides important insights and lessons for businesses more broadly, says UNSW Business School's Felix Tan

Measuring The Tourism Impact Of Covid-19, Singapore Management University

Perspectives@SMU

The initial lockdown in Wuhan in China’s Hubei province, the rise of infection cases and subsequent lockdowns in individual markets all contributed to a reduction in travel and booking activities, according to a new study conducted by The Chinese University of Hong Kong (CUHK). However, different regions showed different sensitivity to COVID-19.

Stock Market Information And Security Prices, Haoyuan Li

Dissertations and Theses Collection (Open Access)

Chapter 1: Analyst report content and stock market anomalies A series of recent papers document that security analyst recommendations tend to contradict stock-mispricing signals. This seems at odds with the large prior literature on the investment value of analyst recommendations. What justifications do analysts make when they write reports on mispriced stocks? I use the latest techniques in machine learning and textual analysis to categorize the qualitative information in a large sample of analyst reports. I find that report content can be intuitively classified into five categories or topics: 1) Growth, 2) Earnings, 3) New developments, 4) Management transactions, and …

Three Essays On International Trade Policies, Xin Yi

Dissertations and Theses Collection (Open Access)

This dissertation studies the empirical and quantitative implications of trade policies. The first chapter examines the effects of trade policies on quality specialization across cities within a country. Specifically, we complement the quality specialization literature in international trade and study how larger cities within a country produce goods with higher quality. We first establish three stylized facts on how product quality is related to agglomeration, firm productivity, and worker skills. We then rationalize these facts in a spatial equilibrium model where all the elements mentioned above are present and firms are free to choose their locations. Using firm-level data from …

Essays On Time Series And Financial Econometrics, Yijie Fei

Dissertations and Theses Collection (Open Access)

This dissertation contains four essays in financial econometrics. In the first essay, some asymptotic results are derived for first-order autoregression with a root moderately deviating from unity and a nonzero drift. It is shown that the drift changes drastically the large sample properties of the least-squares (LS) estimator. The second essay is concerned with the joint test of predictability and stability in the context of predictive regression. The null hypothesis under investigation is that the potential predictors exhibit no predictability and incur no structural break during the sample period. We first show that the IVX estimator provides better finite sample …

When Crises Happen: Coronavirus And What We Expect For Global Growth, Waqas Adenwala

Asian Management Insights

An unflinching take on the negative effects on growth from both demand and supply channels.

Consumption, Investment, Integration And Digitalisation Lead Growth In Asia, Piyush Gupta, Havovi Heerjee Joshi

Asian Management Insights

An interview with Piyush Gupta, Chief Executive Officer and Director of DBS Group, about the Asia growth story and the future of banking.

Land Policy And Welfare In China, Xin Zou

Dissertations and Theses Collection (Open Access)

This dissertation quantitatively studies the impact of land policy on welfare in China. There are two specific nationwide land policies of importance on which I focus: 1) The red-line policy that imposes a minimum 1.2 million square kilometers for agricultural use only 2) The zoning policy for urban land that strictly regulates the amount of industrial and residential land usages respectively; In the first chapter, I give an introduction about the land policy and institutional background in China and the related literature to my dissertation. Second chapter builds a two-sector(two-region) model to examine how the red-line policy interacts with land …

The Effect Of Endogenously-Determined Bullying On Test Scores, Hisham Bin Yacob Patel

Dissertations and Theses Collection (Open Access)

The problem of bullying is one of the main sources of adverse school environment. In this dissertation, I explore the effect of bullying on test scores, under the assumption that bullying is endogenously determined. Comparing my estimates with that from traditional OLS, I find that estimates from OLS grossly underestimates the effect of bullying on short-term student outcomes. I also find significant evidence of heterogeneity across various sub-groups; for example, male students are found to be less affected by bullying as compared to their female peers. Furthermore, male students are also found to be less affected by physical bullying while …

Stochastic Capacity Management In The Presence Of Production Resource Disruption, Boya Yang

Dissertations and Theses Collection (Open Access)

This dissertation studies the capacity investment decision of a manufacturing firm facing demand uncertainty in the presence of shortage possibility in production resources, as often ignored in the literature. These production resources can be physical resources (component / raw material) or financial resources (working capital / budget). The shortage in these resources can be caused by a variety of supply chain disruptions; examples include global disruptions like COVID-19 and financial crisis in 2008 and local disruptions like shortage of components/workforce. The dissertation analyses two important issues related to capacity management: (i) the effect of production resource disruption on the capacity …

Examining The Impact Of It Investment On Insurer Productivity: A Bootstrapped Malmquist Frontier Analysis Approach, Jee Yuen Yew

Dissertations and Theses Collection (Open Access)

This paper attempts to examine productivity changes of insurance companies in Singapore as represented by bootstrapped Malmquist indices, generated from a data envelopment analysis (DEA)-based frontier analysis, and attribute these changes to an increasing investment in information technology infrastructure and equipment, and increasing investment in staff enhancement. Through this analysis, the author finds that there has been a general increase in productivity and efficiency from 2011 – 2017, as seen from changes in the kernel density functions of productivity change between the two periods. The author also finds, through running a panel tobit regression model, that there is a positive …

Identifying Latent Grouped Patterns In Cointegrated Panels, Wenxin Huang, Sainan Jin, Liangjun Su

Research Collection School Of Economics

We consider a panel cointegration model with latent group structures that allows for heterogeneous long-run relationships across groups. We extend Su, Shi, and Phillips (2016, Econometrica 84(6), 2215-2264) classifier-Lasso (C-Lasso) method to the nonstationary panels and allow for the presence of endogeneity in both the stationary and nonstationary regressors in the model. In addition, we allow the dimension of the stationary regressors to diverge with the sample size. We show that we can identify the individuals' group membership and estimate the group-specific long-run cointegrated relationships simultaneously. We demonstrate the desirable property of uniform classification consistency and the oracle properties of …

Deviance Information Criterion For Latent Variable Models And Misspecified Models, Yong Li, Jun Yu, Tao Zeng

Research Collection School Of Economics

Deviance information criterion (DIC) has been widely used for Bayesian model comparison, especially after Markov chain Monte Carlo (MCMC) is used to estimate candidate models. This paper first studies the problem of using DIC to compare latent variable models when DIC is calculated from the conditional likelihood. In particular, it is shown that the conditional likelihood approach undermines theoretical underpinnings of DIC. A new version of DIC, namely DICL, is proposed to compare latent variable models. The large sample properties of DICL are studied. A frequentist justification of DICL is provided. Like AIC, DICL provides an asymptotically unbiased estimator to …

Estimating The Benefits And Costs Of Forming Business Partnerships, Jungho Lee

Research Collection School Of Economics

I estimate a matching model of business‐partnership formation to quantify the relative importance of productivity gains, financing gains, and the coordination failure of effort provision (moral hazard) among partners. Productivity gains account for 61% of the gain from the observed partnerships. For partners in the first quartile of the wealth distribution, however, financing accounts for 93% of the gain. The cost of moral hazard corresponds to 42% of the entire gain from partnerships. A loan policy specifically targeting partnerships is less effective in improving welfare than a conventional loan policy that provides loans to individual entrepreneurs.