Paper A thesis for a Degree Master’s thesis (Paper Awarded at Hitotsubashi University) Working Paper “Optimal investment and reinsurance strategy for mean-variance insurers in a dependent risk model using a linear Gaussian stochastic factor model” (with Hiroaki Hata and Kazuhiro Yasuda) Research Project Preferences under Risk and Information Frictions: Evidence from High-Frequency Racetrack Betting Data (with Kazuhiro Teramoto, Suguru Otani) Estimation Mehtods of Expected Inflation Rates with TIPS Experience Based Learning Models with an OLG Framework Diagnostic Expectations and Macroeconomic Consequences via Financial Markets Pricing Problem with cryptocurrencies