There's the Shift Index by Deloitte's Center for the Edge, which shows a long-term secular decline in return on invested capital (ROIC) from 1965 to 2009 by 75%. It's fallen from 6.2% to 1.3%, and is on track to negative returns in a little over a decade. http://redd.it/1y3z3n
There's the relationship of GDP growth to the price of oil (WTI), as portrayed in this FRED graphic from 1945 - 2012: http://i.imgur.com/hfBRw9f.png
Prior to 1974, WTI tracked a very predictable 2.5% price trend. This was the period during which the TRC, Texas Railroad Commission, effectively set the price for oil through extraction (production) quotas. In March of 1971, the TRC lifted those quotas, effectively removing any limits on extraction rates. US oil extraction had peaked. 1971 is the watershed. Oil prices never resume their previous level of stability, and GDP cycles become more random and volatile. Afterward, oil prices are often higher (much of the 1970s and 2000s), sometimes lower (1984 - 1999), but always volatile. The regularity of GDP cyclical trends is lost. http://redd.it/1tz6y2
Though there have been financial panics before, the period from 1929 - 2007 is exceptionally notable for its lack of any widespread panics. There were a few edgy times -- going off Bretton-Woods in 1971, the 1987 stock market crash, the Asian currency crises of the 1990s, but central banks held the show together until 2008 and the fall of Lehman Brothers. Observers such as Michael Lewis, particularly in The Big Short, have commented on the financial restructuring that's sustained paper profits while real wealth growth is questionable. The YC and HN crowd might want to look at where all that magic money making Rails coders so much more valuable than janitors comes from, and how long the music will play.