Thesis: S.M. in Management Research, Massachusetts Institute of Technology, Sloan School of Management, 2018.Cataloged from PDF version of thesis.Includes bibliographical references (pages 39-43).Exploiting a high frequency dealer-specific quote database in the FX market, I show that shocks to the CDS of a financial intermediary, proxy for its financial wealth, makes her quote larger bid-ask spreads when uncertainty about the underlying traded asset is high or when market competition is low. I first establish that markets are dominated by a handful of dealers who are responsible for more than 90% of the quotes in the different FX spot markets. I then document that, when exchange rate volatility is high, a 1% increase in intermediary's defau...