Please do not waste your time with this audiobook. As others have noted, the questions are in no way tough or different from what you'll find anywhere else.
However, note that his answers are also bad; Portney sounds nervous and unsettled (terrible to listen to- i wish the sound sample had his laugh) and is extremely repetitive. This means that A) much of the meager 1 and a quarter hour is wasted B) many sample answers are circular and sound poorly thought out.
I went to his website and couldn't even find a resume, cv or employment history: very suspicious. Also, it seems like it was written by a six-year-old.
In summary, just because you confidently paste your name and face all over your work doesn't mean you are an authority. Pull the other one, Portney.
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