112 страниц. 2012 год. LAP Lambert Academic Publishing We analyse the Singapore foreign exchange market from a microstructure approach. Specifically, by modifying and applying the empirical methodology designed by Bollerslev and Melvin (1994), we examine the relationship between bid-ask spreads and the underlying volatility of the USD/SGD. Our data set comprises high-frequency USD/SGD tick data of three separate periods (April-June 1989, April-May 2006, April-May 2009). We found that for the USD/SGD: i) the size of bid-ask spreads are positively related to the underlying exchange rate volatility; ii) the magnitude of the dependence on underlying volatility increases as tick volume increases; and iii) the size of the bid-ask spreads may also be positively related to the directional movement of exchange rates. This book is originally a thesis submitted by the author to the Singapore Management University School of Economics in partial fulfillment of the requirements for the Degree of Master of Science in Economics.