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By at least one measure, these countries rank worst in the world, according to the International Monetary Fund's estimates.
Despite its rich resources, the Democratic Republic of the Congo has battled violence, poverty and systemic corruption after gaining its independence from Belgium in 1960.
Congo's economy is growing at a relatively rapid clip of 6% to 7% a year as it recovers from years of internal conflict over the nation's substantial resources -- including tin ore and diamonds. But its total gross domestic product remains small at around $25 billion. Coupled with a population that exceeds 73 million, Congo occupies the final spot on the IMF's list of per capita gross domestic production, with a total production of just $231 per person.
Much of the nation's economic activity takes place in the informal sector, and is not counted in official GDP estimates.