See also Amarante and Jimenez (2015), World Bank (2014), Piketty (2007), Atkinson, Piketty and Saez (2011), Bollinger and others (2015), Burdfn, Esponda and Vigorito (2015) and Campos, Chavez and Esquivel (2014). The way in which extreme values are processed may also have an effect: sometimes, these figures are removed or top-coded. The share of high incomes also grew significantly in English-speaking countries, owing in part to the growth in pay among the top groups.