Macroeconomics 11th Edition by Michael Parkin

Exercise 20

Makani Power: A Mighty Wind
Saul Griffith, a 34-year-old Australian, has developed a new wind-power technology for generating electricity that is vastly more efficient than conventional wind power. A Makani Airborne Wind Turbine is a tethered wing, somewhat like a giant kite, that generates power by flying in large circles where it captures a stronger and more consistent wind. One of Makani's investors is Google. The Makani technology uses 90 percent less material than a conventional wind turbine and accesses wind that is out of reach for land or sea-based turbines.
Explain which growth theory best describes the news clip.