Dr. Tony Alessandra interviews Jeff Blackman on peak performance. Jeff compares individuals to a share of stock and its P/E ratio. For individuals, the ´´P´´ is their productivity, persistence, pride, and profitability. The ´´E´´ for individuals is their energy, effort, excitement. and execution. 1. Language: English. Narrator: Tony Alessandra. Audio sample: http://samples.audible.de/sp/ales/000008/sp_ales_000008_sample.mp3. Digital audiobook in aax.