COMPARATIVE ADVANTAGE

Please provide scholarly Http or URL reference for each question , please complete in 8 hours/ 200 words for each question. 1. What is an exchange rate? ?Please provide some examples. Links provided by Professor: http://economics.about.com/library/weekly/aa022703a.htm
http://www2.princetonreview.com/careers/70/foreign-exchange-trader 2. What do we mean by the term ABSOLUTE ADVANTAGE? What about the term COMPARATIVE ADVANTAGE?