This Book consists of three independent essays on International Economics. Chapter 1
studies the effects of Covid vaccine development on the international financial market.
Covid vaccine development has received worldwide attention since the beginning of the
pandemic. In this paper, I construct a weekly sentiment index about Covid vaccine
development progress using the pre-trained NLP model Fin-BERT based on four major
US newspapers. I show that the vaccine development sentiment has significant impacts
on the international financial market. Positive vaccine development sentiment is
associated with a decrease of VIX index, significant weekly capital inflows into emerging
markets and an appreciation of emerging market currencies against US dollars. Then, I
use the consumption-based asset pricing model to decompose the currency carry trade risk
premia between US and emerging markets into the quantity of US consumption growth
risk and the unit price of risk. I find that positive vaccine development sentiment also
decreases the price of risk in the international financial markets.