【Abstract】This paper analyzes influence of an additional referee on number of fouls by using the data from Women’s Japan Basketball League (WJBL) in order to examine whether number of police officers affects the crime rate. For the season of 2010-2011, the upper league of the WJBL introduced 3 referees system for the adaption of the international standard. Using this natural experiment, the Dif...

We use a matched difference-in-difference design to estimate the time profile of the impacts on household consumption and income of an aid-financed poor-area development project in rural China. Sampled households in project and matched comparison villages were followed up annually over the project’s disbursement period. We find that beneficiaries saved about half the total income gain attribute...

This paper comments on “The Price Effects of Hospital Mergers: A Case Study of Sutter-Summit Transaction,” by Steven Tenn. I exposit a simple model of differentiated products competition and consider the implications of Tenn’s findings in the context of this model. I find that Tenn provides compelling evidence that the merger led to a price increase at Summit Hospital. The causes of the price i...

Recently, stock exchanges have altered their trading fees to subsidize liquidity by offering “make” rebates for providing liquidity through limit orders and charging “take” fees for consuming liquidity via marketable orders, leading to debate regarding the impact of these fees on market quality. Using an exogenous experiment performed by NASDAQ in 2015, I employ difference-in-differences analys...

In 2003, the Japanese Diet passed legislation to abolish part of the special deduction for spouses (Haigusha Tokubetsu Kojo) which would take effect in the 2004 tax year. This paper investigates the impact of this tax reform on female labour supply in Japan. A number of earlier studies have shown that married women are likely to adjust their labour supply in order for their husbands to become e...

We analyze the relationship between Antidumping (AD) Protection and the productivity of EU domestic firms in import-competing industries. For this purpose we identify a panel of domestic firms between 1993 and 2003 that at some point during this period are affected by AD initiations. Using a difference-in-difference approach, we find that AD measures result in improvements of measured productiv...

Using a difference-in-difference methodology, we find that the state-level banking deregulation of local U.S. credit markets leads to significant increases in the reallocation of labor within local industries towards firms with higher marginal products of labor. Using firm production functions estimated with plant-level data, we propose and examine an approach that quantifies the industry produ...

Generally, determining the size and magnitude of the omitted variable bias (OVB) in regression models is challenging when multiple included and omitted variables are present. Here, I describe a convenient OVB formula for treatment effect models with potentially many included and omitted variables. I show that in these circumstances it is simple to infer the direction, and potentially the magnit...

The authors provide evidence on the impact of foreign ownership on labor market outcomes analyzing pay differences between foreign-acquired and domestically owned firms. For this purpose, they use firm-level data from 16 European countries over the time period 1999–2006. Combing propensity score matching techniques with difference-in-differences (DID) estimators the authors estimate positive wa...