They both seem to follow a mathematical relationship called a “power law” where you have lots of small events trailing off into infrequent but much bigger events, according to a McKinsey study. (So don’t assume stability, look into the deep past not recent history, look for early warning signs and study complex systems. ) Now this is a great chart from the McKinsey study:
Instead of running $800 billion budget surpluses — as was predicted back in the 1990s — America is running trillion dollar deficits. How did that $2 trillion swing happen? The blame breakdown, according to the NYTImes: recession, 37 percent, Bush policies (particularly tax cuts and the prescription drug benefit), 33 percent; Obama continuing Bush policies (Iraq, tax cuts) 20 percent, the Obama stimulus bill, 7 percent; and the rest of the Obama “investment agenda, 3 percent.