One theory to explain these phenomena was offered by the authors of the "Time to Build" paper, and
 invokes the neoclassical growth theory to explain 
One theory to explain these phenomena was offered by the authors of the "Time to Build" paper, and
 invokes the neoclassical growth theory to explain them so that interpretations of these phenomena agree
 with long term growth models. That theory, developed by Finn Kydland and Edward Prescott assumes that
 technology shocks are the cause for them. Wesley Mitchell is best known for his work regarding these
 phenomena, and Austrian theory invokes credit levels as the cause of these phenomena, while William
 Jevons thought that varying sunspot levels are the cause for these. They have variable periodicity, as
 described by Kondratieff waves and Kuznets waves, and in the United States they are tracked by the
 NBER. For 10 points, identify these phenomena which are characterized by booms and busts in economic
 activity.
One theory to explain these phenomena was offered by the authors of the "Time to Build" paper, and
 invokes the neoclassical growth theory to explain them so that interpretations of these phenomena agree
 with long term growth models.
{business cycles} [accept: {business cycle} fluctuations]