This study attempted to improve the self-sufficiency ratios of food and feed crop under the national export expansion strategy for natural resource products.　To achieve the government’s food and feed crop self-sufficiency ratio targets for the fiscal year 2030, we used the nine interregional CGE （9SCGE） model to demonstrate strategies for agricultural policy implementation, factoring in the regional variations of Japan’s grain-producing areas.　This presentation was defined through four policy simulations based on the projected economic environment of the target year 2030.　From these results we can make the following conclusions.　First, to improve grain productivity the regions suitable for producing highly import-dependent grains such as wheat, soybeans and corn should be selected, while taking measures to improve the productivity of livestock and fisheries by combining subsidy amounts among these two industrial sectors.　However, according to present circumstances, these efforts appear insufficient for reaching the government’s targets.　Second, an increase in food self-sufficiency ratios will improve the ratios of these grains.　In this regard, the country-wide shrinkage of agricultural farmland can be utilized for livestock feed to bring a shift in the import-dependency of corn production.　However, in some respects, trade-offs between increasing grain self-sufficiency ratio and expanding food exports need to be accepted from the perspective of Japan’s food security prioritizations.　Third, if we promote a strategy to expand food exports without strengthening the competitiveness of feed-crop related industries, import-dependency of feed crops will still increase to an extent that further decreases the current feed self-sufficiency ratio, and thus the government targets remain unachieved.　To work toward a targeted ratio for feed self-sufficiency, subsidizing the feed-crop related industries is imperative.　Fourth, as Japan’s overall food self-sufficiency ratio increases, the urban–rural gap in food self-sufficiency is likely to widen.

JEL Classification:R51, Q17, Q18, R13

　In 2022, the reported number of all criminal offences in Japan was approximately 600,000 cases, but these offences have decreased in recent years.　However, theft crime rate against reported criminal offence is very high so it is vitally important to decrease theft crimes by strengthening crime prevention against theft crimes.　There are various possible causes of theft crimes.　In addition to patrols and other crime prevention activities by the police, crime prevention measures such as security cameras have been implemented in Japan.　For further reduction of theft crimes, more policies should be introduced.　In this study, we focused on bicycle theft crimes predominant in Japan.　Firstly, to grasp the factors that have influenced bicycle thefts, we estimated the spatiotemporal situations of these crimes by determining the point and density using GIS （Geographic Information System）.　Secondly, we determined the relationships between the usual activities of people and bicycle thefts.　Therefore, we analyzed the influence of human mobility characteristics obtained from person trip data.

　As a result of the analysis, we determined the spatial occurrence situation of bicycle theft high-crime areas using the kernel density estimation method by time zone.　In addition, we revealed that difference in crowd condition of person trip on weekdays and on weekends influences the occurrence point and the occurrence number, occurrence time zone of bicycle theft using Geographically Weighted Regression.

JEL classification:R49

  Regional travel has been greatly affected by COVID-19.　The purpose of this study was to analyze how the coronavirus outbreak and the related policies changed the number of tourists and business overnight guests at the prefecture level.　We quantitatively clarified the relationships between changes in the number of guests since before COVID-19 and the implementation period of the related policies （emergency declaration, GoTo travel campaign, vaccination, travel support at national and regional level, semi-state of emergency） by applying the fixed effect model.　The results showed these policies have significantly affected the number of tourist guests from outside the prefecture.　This analysis contains useful information that contributes to the formulation of resilience policies against such infectious diseases in the future.

JEL Classification:R15, Q54, Z30