text: ok, nerds, World-systems perspectives invokes Kondratieff waves of expansion & contraction. 
  Here's the historical list (from Shannon 1989, an intro to W-S)
  
  extrapolating:
  B phase 1967-2008/11
  A phase 2008/11-2024
  B phase 2024-2050?
  
  the model tracks: welcome to the Big Suck for the next 20 years.