Public unhappiness amongst working class, caused by economic downturn.
Economic downturn, caused by deficit spending and subprime lending.
Deficit spending and subprime lending, caused by need of government to remain popular through popular policies and derestriction of banks.
Need of government to remain popular caused by the democratic system.
Democratic system caused by human need to feel power, even if that power is only illusory.
Human nature, but in terms of what's changeable, the economic repercussions of democracy. :)