The MPT file contains 3 parts for the PTD. The first two parts are drafts of empirical research papers. The third is a 2-page research proposal with motivation and literature briefly outlined. The first part assessed factors on invoicing currency choices for trade with China. The second studied the trilemma hypothesis in response to the notions of a policy dilemma and macroprudential policies. The third part plans to address impacts of digital commerce on price level and economic structure.