Autores:
  • I know that you don't know, but you don't know that you don't know! By that I mean there are three reasons why individuals and businesses fail: 1. Arrogance 2. Arrogance 3. Arrogance.

    "Harvey Mackay Book Interview : The Mackay MBA of selling in the real world". Interview with David Dalka, www.daviddalka.com. November 29, 2011.