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We report results from a randomized natural field experiment conducted in a restaurant dining setting to distinguish the observational learning effect from the saliency effect. We find that, when customers are given ranking information of the five most popular dishes, the demand for those dishes increases by 13 to 20 percent. We do not find a significant saliency effect. We also find modest evidence that the observational learning effects are stronger among infrequent customers, and that dining satisfaction is increased when customers are presented with the information of the top five dishes, but not when presented with only names of some sample dishes.

China introduced its stringent family planning policies in the early 1970 s, known as the “Later, Longer, Fewer” policies, and followed it with the One-Child Policy in 1979. The number of children born to Chinese parents significantly decreased from 5.7 in the late 1960 s to 2.5 in 1988. In Chen and Fang ( 2021 ), we show that family planning policies have drastically different effects on older parents’ physical and mental well-being. Whereas parents more exposed to the family planning policies consume more and enjoy slightly better physical health status when they enter their old age, they report more severe depression symptoms. In this paper, we present the heterogeneity of mental health across demographics and socioeconomic status. We pay particular attention to the role of children. Our findings indicate that parents with no or only one child experience faster deterioration in mental health status as they age. This pattern is observed only among older people who are not living with children. Our findings highlight the role of family support for the mental health status among older Chinese.

We provide evidence of advantageous selection in the Medigap insurance market and analyze its sources. Conditional on controls for Medigap prices, those with Medigap spend, on average, $4,000 less on medical care than those without. But if we condition on health, those with Medigap spend $2,000 more. The sources of this advantageous selection include income, education, longevity expectations, and financial planning horizons, as well as cognitive ability. Conditional on all these factors, those with higher expected medical expenditures are more likely to purchase Medigap. Risk preferences do not appear as a source of advantageous selection; cognitive ability is particularly important.

We report results from a large, randomized field to study how access to formal microinsurance affects production and economic development. We induce exogenous variation in insurance coverage at the village level by randomly assigning performance incentives to the village animal husbandry worker who is responsible for signing farmers up for the insurance. We find that promoting greater adoption of insurance significantly increases farmers' sow production, and this effect seems to persist in the longer run; moreover, the increase in sow production in response to the sow insurance does not seem to be the result of the substitution of other livestock.

We empirically implement a dynamic structural model of labor supply and welfare program participation for agents with potentially time-inconsistent preferences. Using panel data on the choices of single women with children from the National Longitudinal Surveys (NLSY) 1979, we provide estimates of the degree of time-inconsistency, and of its influence on the welfare take-up decision. With these estimates, we conduct counterfactual experiments to quantify a measure of the utility loss stemming from the inability to commit to future decisions, and the potential gains from commitment mechanisms such as welfare time limits and work requirements.

Corruption is a widespread phenomenon in many developing and transitional economies. China is a country in profile both in the prevalence of corruption and in its attempts to root out corruption. The recent anti-corruption campaign in China, which started in December of 2012 when President Xi Jinping took power, is unprecedented in its magnitude and time length. It has had lasting impact on the functioning of the Chinese bureaucracy and on the behavior of firms and consumers. It also provides unusual amount of data to study the causes and consequences of corruption, which will have implications for other countries and economies. In this review, I discuss the definition and measurement of corruption with a particular focus on the measurements that highlight the city-level heterogeneity of corruption in China and present simple frameworks to understand the determinants of corruption by government officials and the causes and consequences of corruption and anti-corruption. I summarize the key findings regarding how the anti-corruption campaign affects the behavior of a host of decisions makers in the economy, including firms and bureaucrats, and on the resource allocation in general, and argue that the lessons from China’s anti-corruption campaign are useful to other developing countries.

We present and empirically implement a dynamic discrete choice model of life insurance decisions to assess the importance of various factors in explaining life insurance lapsation. We estimate a model using information on life insurance holdings from the Health and Retirement Study. Counterfactual simulations using the estimates of our model suggest that a large fraction of life insurance lapsations are driven by idiosyncratic shocks, uncorrelated with health, income, and bequest motives, particularly when policyholders are relatively young. As the remaining policyholders get older, however, the role of such independent and identically distributed (i.i.d.) shocks gets smaller, and more of their lapsation is driven by income, health, or bequest motive shocks. As anticipated, income and health shocks are relatively more important than bequest motive shocks in explaining lapsation when policyholders are young, with bequest motive shocks playing a more important role as we age.

We propose a novel and easy-to-implement approach to detect potential overbilling based on the hours worked implied by the service codes which physicians submit to Medicare. Using the Medicare Part B Fee-for-Service (FFS) Physician Utilization and Payment Data in 2012 and 2013 released by the Centers for Medicare and Medicaid Services, we construct estimates for physicians' hours spent on Medicare beneficiaries. We find that about 2,300 physicians, representing about 3 percent of those with 20 or more hours of Medicare Part B FFS services, have billed Medicare over 100 hours per week. We consider these implausibly long hours.

Matsumoto (2020) pointed out data and coding errors in Fang and Gong (2017). We show that these errors have limited impacts: all qualitative findings remain after correcting them. Matsumoto also discussed potential service overcounting in the aggregated utilization data we used to illustrate our method, and then quantified the extent of overcounting with a sample of Medicare claims. We acknowledge the issue but discuss the noise and the bias in his quantification. Overall, our proposed method remains useful, as regulators who are interested in applying the method are unlikely to be subject to the data limitations.

We propose entertainment and travel costs (ETC) expenditures as a measure of corruption in Chinese firms. These expenses are publicly reported in firms’ accounting books, and on average they amount to about 3 percent of a firm’s total value added. We find that ETC is a mix that includes grease money to obtain better government services, protection money to lower tax rates, managerial excesses, and normal business expenditures to build relational capital with suppliers and clients. Entertainment and travel costs overall have a significantly negative effect on firm productivity, but we also find that some components of ETC have substantial positive returns to firms.