what is Economic?

http://search.tb.ask.com/search/video.jhtml?searchfor=economics+definition&p2=%5EBDG%5Exdm096%5EYYA%5Eid&n=780bd026&ss=sub&st=tab&ptb=E9A7CEB8-F90E-46AA-A4F4-E05B12CDA778&tpr=sbt