 The higher incomes were derived from the suburb's white-collar base; 63.5% of Yarralumla's workforce was employed as professionals or in managerial posts, compared to 35.2% nationally.In contrast, only 3.4% were engaged in blue-collar occupations, compared with 15.8% for the nation as a whole.The proportion of the population working as tradesmen and technicians was almost four times lower than average across Australia.