This thesis is targeting on proposing a new variable selection method and showing its applications in financial markets. Statistically, this thesis constructs a new adaptive variable selection criterion, proves its same asymptotic rate with mini-max estimator, and shows its effectiveness in...

This dissertation consists of two essays concerning search-theoretic monetary economics. The issues studied here are about search and matching, which requires models with an explicit microfoundation. The meaningful economic intuitions and policy implications we get justify the necessity of this...