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Guns and Roses: Police Complicity in Organized Prostitution
Guns and Roses: Police Complicity in Organized Prostitution
Police complicity in organized crime is not uncommon, yet it is extremely difficult to examine empirically. Using unique sex transaction data from China, we show that police can be complicit in organized prostitution. Specifically, we document that sauna houses and massage parlors with greater neighborhood police density are likely to be “protected” by police and thus can host higher-risk, higher-penalty sex business. The complicity effect is particularly salient during periods of local prostitution crackdowns, implying selective enforcement. Changes in local leadership and visits of the central government’s discipline teams can attenuate the complicity effect.

Coordinating Installation of Electric Vehicle Charging Stations between Governments and Automakers
Coordinating Installation of Electric Vehicle Charging Stations between Governments and Automakers
Accessibility of Electric Vehicle (EV) charging stations is an important factor for adoption of EV, which is an effective green technology for reducing carbon emissions. Recognizing this, many governments are contemplating ideas for achieving EV adoption targets, such as constructing extra EV charging stations directly or offering subsidies to entice automakers to construct more EV charging stations. To achieve these targets, governments need to coordinate with automakers to ensure that the total number of charging stations is planned optimally. We study this coordination problem by considering the interactions among the government, automakers, and consumers, our equilibrium analysis yields three major results. First, both the government and the automaker should build extra EV charging stations when their construction costs are independent. Simultaneously, the government should offer a per-station subsidy to the automaker only when the adoption target and the construction cost are both high. However, when the construction costs are dependent, the government should delegate the construction to the automaker by offering a per-station subsidy. Second, when the government considers consumer purchase subsidy as an extra lever, we find that the purchase subsidy for consumers is more cost-effective than offering a per-station subsidy to the automaker. Third, the structure of the optimal government policy remains the same regardless of whether the government's goal is to improve EV adoption or consumer welfare. Our results can serve as guidelines for governments when contemplating coordination with automakers for the construction of EV charging stations to improve EV adoption as well as consumer welfare further.

Scheduling of Physicians with Time-Varying Productivity Levels in Emergency Departments
Scheduling of Physicians with Time-Varying Productivity Levels in Emergency Departments
Emergency department (ED) overcrowding and long patient wait times have become a worldwide problem. We propose a novel approach to assigning physicians to shifts such that ED wait times are reduced without adding new physicians. In particular, we extend the physician rostering problem by including heterogeneity among emergency physicians in terms of their productivity (measured by the number of new patients seen in 1 hour) and by considering the stochastic nature of patient arrivals and physician productivity. We formulate the physician rostering problem as a two-stage stochastic program and solve it with a sample average approximation and the L-shaped method. To formulate the problem, we investigate the major drivers of physician productivity using patient visit data from our partner ED, and find that the individual physician, shift hour, and shift type (e.g., day or night) are the determining factors of ED productivity. A simulation study calibrated using real data shows that the new scheduling method can reduce patient wait times by as much as 13% compared to the current scheduling system at our study ED. We also demonstrate how to incorporate physician preference in scheduling through physician clustering based on productivity. Our simulation results show that EDs can receive almost the full benefit of the new scheduling method even when the number of clusters is small.

Purple Haze, All in My Brain
Purple Haze, All in My Brain
Jian Zhang from the HKU Business School along with authors from the Shanghai Advanced Institute of Finance at Shanghai Jiao Tong University, INSEAD in Singapore and the PBC School of Finance at Tsinghua University, helped to advance understanding of this phenomenon in their recent paper, called Air Pollution, Behavioral Bias, and the Disposition Effect in China. The team studied how air pollution can affect mental health by intensifying a certain type of cognitive bias observed in financial markets.
Future Anxiety – How COVID-19 Led People to Save More Money
Future Anxiety – How COVID-19 Led People to Save More Money
Take the recent study by Chen Lin and Mingzhu Tai from the HKU Business School, conducted with collaborators from the University of California, Berkeley and the Chinese University of Hong Kong. Their paper addressed a fundamental worry for almost everyone during the pandemic: Money. Specifically, they examined how people in the U.S. saved money in response to COVID-19.
Copying gender practices from MNCs is good for business
Copying gender practices from MNCs is good for business
In their study “Do multinationals transfer culture? Evidence on female employment in China”, published in the Journal of International Economics in July 2021, authors Heiwai TANG and Yifan ZHANG show that MNC practices do impact the behaviour of local companies, and the outcome is a positive impact on the productivity of local companies.
Learning to Coordinate in Firms’ Behaviours  – Dr. Jasmine Yu HAO
Learning to Coordinate in Firms’ Behaviours – Dr. Jasmine Yu HAO
While computer languages may sound alien to economics, I aim to showcase that good programming skills are conducive not limited to economic research, it can also open up endless career possibilities for you in the business world.

To Imagine the Future of Digital Currencies – Dr. Yang YOU
To Imagine the Future of Digital Currencies – Dr. Yang YOU
As a teacher, I will push myself to understand the expectations of local employers' and the market dynamics of Hong Kong.

From Quantum Physics to Quantitative Marketing – Dr. Chu (Ivy) Dang
From Quantum Physics to Quantitative Marketing – Dr. Chu (Ivy) Dang
As a science person, I am impressed by our students' strong business acumen. But as a teacher, other than teaching them how to use quantitative tools to make scientific claims, I also hope that I can encourage them to continue to stay inquisitive about the world and apply their classroom knowledge for the betterment of the society.

To Inspire and be Inspired – Dr. Tingting FAN
To Inspire and be Inspired – Dr. Tingting FAN
Born with a curious mind, Dr. Tingting Fan craves to explore and explain human behaviours with scientific models. Joining us in December 2021, she is a Senior Lecturer in Marketing.
An Interdisciplinary Approach to Digital Innovation & Transformation – Professor Yulin FANG
An Interdisciplinary Approach to Digital Innovation & Transformation – Professor Yulin FANG
Professor Yulin Fang is a seasoned scholar, professional case writer, veteran IT consultant, and editor for several internationally renowned journals. Seeing HKU Business School as a supernova in the academic landscape, Professor Fang is keen to contribute his intellectual might on digital innovation and transformation to our School’s journey of excellence.  Joining us in September 2021, Professor Fang will be leading our School’s newly formed research centre, the Institute of Digital Economy and Innovation (IDEI).  
Thriving at the Forefront of Information Technologies – Dr. Zhepeng LI
Thriving at the Forefront of Information Technologies – Dr. Zhepeng LI
Aspired to make a difference than making a fortune, Dr. Zhepeng Li is dedicated to propel the development of information systems and machine learning technologies.
Applying Indifference Curve Theory in Product Design Strategy
Applying Indifference Curve Theory in Product Design Strategy
無差異曲線圖是一個經濟學工具,分析消費者如何將固定的預算分配在不同的產品上,從而達到最大的效益,相信曾修讀經濟學的讀者會對以下的典型無差異曲線圖感到熟悉。
Hong Kong to become an ESG hub and a zero-carbon economy
Hong Kong to become an ESG hub and a zero-carbon economy
「環境、社會及管治」(Environmental, Social, and Governance;簡稱ESG)近年成為全球熱門話題。近日環球金融市場備受時局動盪影響,市民因受「息誘」,對綠色債券趨之若鶩,但對其背後意義及對經濟的影響,到底有多少認識?
The Era of High Inflation
The Era of High Inflation
這兩天是美國聯儲局公開市場委員會議息的日子,市場一般預期聯邦基金利率會上調0.5厘。如果屬實,將會是聯儲局自2000年3月以來首次作半厘幅度的加息。在過去22年間,若聯儲局決定加息,每次都只會增加0.25厘的息率,反映是次決策的不尋常。除息率外,市場也關注聯儲局什麼時候開始「縮表」,也就是減少債券持有量。眾所周知,這些關注都源於美國通脹率持續按月攀升,從去年3月的2.6%(按年)增加至本年3月的8.5%。
Applying Indifference Curve Theory in Product Design Strategy
Applying Indifference Curve Theory in Product Design Strategy
無差異曲線圖是一個經濟學工具,分析消費者如何將固定的預算分配在不同的產品上,從而達到最大的效益,相信曾修讀經濟學的讀者會對以下的典型無差異曲線圖感到熟悉。
Hong Kong Becomes World’s Must-Watch Market as Easy Money Ends
Hong Kong Becomes World’s Must-Watch Market as Easy Money Ends
For global investors trying to gauge the fallout from surging interest rates and slowing economic growth, Hong Kong is quickly emerging as a must-watch market. Perhaps nowhere else is as exposed to two of the biggest worries roiling global asset prices -- the Federal Reserve’s rapidly tightening monetary policy and China’s sputtering economy.

香港經濟:「驚濤駭浪」的一季度GDP收縮4% 復蘇面臨諸多限制
香港經濟:「驚濤駭浪」的一季度GDP收縮4% 復蘇面臨諸多限制
5月13日香港特區統計處發佈一季度本地生產總值(GDP),同比收縮4%,中斷了過去連續四個季度的復蘇勢頭。香港財政司司長陳茂波形容,2022年第一季度充滿驚濤駭浪,第五波疫情對經濟造成沉重打擊。