Leaders0 <- MaddisonLeaders() # max GDPpc for each year.
# Presumed technology leaders without commodity leaders with narrow
# economies
Leaders1 <- MaddisonLeaders(c('ARE', 'KWT', 'QAT'))
# since 1600
MadDat1600 <- subset(MaddisonData, year>1600)
Leaders1600 <- MaddisonLeaders(c('ARE', 'KWT', 'QAT'), data=MadDat1600)
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