Per capita GDP is currently about $900 higher in Angola ($3000.4) than in Kenya ($2099.3), according to the most recent data available from the World Bank. Yet Kenya is currently growing faster, with 4.8% annual GDP growth compared to Angola's 3%. If these growth rates are maintained in the future, how many years will it take for Kenya's GDP per capita to overtake Angola's? And why do small differences in growth rates matter?