But the main fuel is local anger over crime and migration.

ECONOMIST: Central Europe��s Roma

Anger continues to fuel activists and big donors.

ECONOMIST: Howard Dean

Given that anger against taxpayer-funded bank bailouts helped fuel the rise of the tea party movement, and in turn the Republican congressional victories of 2010, this constitutes a serious strategic mistake.

CNN: Why Mitt Romney is losing

Unfortunately, too many governments in emerging markets have tried to quell inflation and reduce popular anger by subsidising the prices of both food and fuel.

ECONOMIST: Oil and the economy