Exploring the causal relationship between hospital length of stay and re-hospitalization among Japanese AMI patients

We explore the causal relationship between hospital length of stay (LOS) and re-hospitalization for Acute Myocardial Infarction (AMI) patients in Japan, where the average LOS is the longest among OECD countries. Using chart-based data, we address the endogeneity between LOS and re-hospitalization probability by using an exogenous variation based on Rokuyo (the six basic labels allocated to each day), which is found to be irrelevant to admission day but relevant to discharge day. While we do find a significant and positive association between LOS and re-hospitalization probability in the OLS estimation, we do not find a significant relationship once LOS is instrumented by Rokuyo in various instrumental variable estimations. This implies that additional stay that was induced owing to patient’s choice of preferred Rokuyo at discharge has no effect on re-hospitalization probability.     

Large but finite games with asymmetric information

Carmona considered an increasing sequence of finite games in each of which players are characterized by payoff functions that are restricted to vary within a uniformly equicontinuous set and choose their strategies from a common compact metric strategy set. Then Carmona proved that each finite game in an upper tail of such a sequence admits an approximate Nash equilibrium in pure strategies.     

The determinants of exit from institutions and the price elasticity of institutional care: Evidence from Japanese micro-level data

This study examines how the price mechanism affects the length of residents’ at institutions and their destination after exit. Using micro-level data from The Survey on Care Service Providers compiled by the Japanese government, we show that the price elasticity of the hazard of exit was 1.7 from welfare care facilities was 1.8 from health care facilities. Moreover, our estimates reveal that a 1 percentage point increase in copayments leads to an increase in the probability of returning home by 0.04% for residents of welfare care facilities and 3.7% for those of health care facilities and a decrease in the probability of being re-hospitalized by 3.3% for residents of health care facilities and 1.9% for those of medical care facilities. Our findings demonstrate that an appropriate price policy may work well to shorten clients’ length of stay and to reduce the number of the socially institutionalized.     

Interaction between tax and accounting practice: Accounting for stock-in-trade

This paper studies the issue of interaction between tax and accounting practice through an examination of the process followed by the Institute of Chartered Accountants in England and Wales (ICAEW) when formulating Recommendation on Accounting Principles (RoAP) No. 22 as a replacement for RoAP No. 10. We show that the ICAEW had a clear intention of persuading the Board of Inland Revenue of the legitimacy of replacement cost as a basis of stock valuation, and that the preparation and publication of RoAP 22 succeeded, to a significant extent, in achieving that outcome. We also reveal that RoAP 22 appears to have affected the way in which some companies valued their stock and how their bases of stock valuation were disclosed in corporate published accounts.