Poverty gap - in 15 seconds
The gap between rich and poor is at the highest level in 30 years, according to the Organisation for Economic Co-operation and Development (OECD).
Its survey of 34 countries also found that income inequality has a "statistically significant impact" on a country's economic growth.
It says rising inequality in the UK has cost the economy almost nine percentage points of GDP growth between 1990 and 2010.
The BBC examines the findings in 15 seconds.