1. http://windward.hawaii.edu/facstaff/briggs-p/macroeconomics/chap_35shortruntradeoff.pdf
2. http://economics.about.com/cs/money/a/print_money.htm
3. http://www.esd.wa.gov/uibenefits/faq/faq-ui.php
4. http://www.intelligent-systems.com.ar/intsyst/unemploy.htm
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