This thesis is intended to consider whether the South American members of the trade bloc, the Pacific Alliance, namely Chile, Colombia, Peru, form an optimum currency area (OCA). An in-depth review into the progression of OCA theory is done to formulate a proper econometric analysis. An empirical investigation is conducted by using main macroeconomic indicators from the time period 2001 to the third quarter of 2014 to examine if the aforementioned countries are within the definition of an OCA. An ordinary least squares regression is done on three major economic indicators to test the causes of the deviation from one another. Evidence suggests the group is currently not an OCA and extensive integration efforts would be needed before the group is within the bounds of forming an OCA.