And figuring out the appropriate size and role of government has always been a source of rigorous and, yes, sometimes angry debate.

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In a passionate and sometimes angry debate, black Brazilian activists insist that slavery's legacy of injustice and inequality can only be reversed by affirmative-action policies, of the kind found in the United States.

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"My first-born sister used to encourage me, my mum also, but my dad sometimes was angry with me, " Yego said.

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"Sometimes you are angry because some mistakes that they did were incredible, " he said.

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Often more level-headed than the others, he was known as the calm member of the group - though he was apparently a heavy drinker and sometimes given to angry outbursts.

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Especially during times of economic hardship, layoffs leave people angry and sometimes vindictive.

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"People are angry at the coalition sometimes, not because we are there, but because we are not providing security, " he said.

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Degree courses are supposed to last five years, but strikes by unpaid teaching staff and riots by angry students mean the academic year often runs late, sometimes a whole year late.

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And sometimes the very people you thought you were trying to help may be angry at you and shout at you.

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The World Bank report goes to great pains to argue that the proverbial angry young man in a poor country resorts to violence not because it is lucrative, though it sometimes can be, but because it provides a source of dignity not dissimilar to that provided by gang membership in poorer parts of the developed world.

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