Supply and Demand Curve Shift in 2 Easy Steps

8 Comments

  • mahad

    Reply Reply 16 October 2011

    I would like to sign and buy for the three months, but I am having difficult to do. any easier guide to use or any phone to contact to you would help.

    thanks

    • David

      Reply Reply 17 October 2011

      Hello Mahad! I emailed you. Cheers!

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  • abdulwhid

    Reply Reply 27 November 2011

    hi sir thank you for your free videos really helpful i will pay premium soon.

    • David

      Reply Reply 29 November 2011

      Good luck with your school Abdul!

  • Perry

    Reply Reply 7 January 2012

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  • Junaida

    Reply Reply 4 December 2013

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