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Before 1949 the Chinese economy was characterized by widespread poverty, extreme income inequalities, and endemic insecurity of livelihood. By means of centralized economic planning, the People's Republic was able to redistribute national income so as to provide the entire population with at least the minimal necessities of life (except during the "three bad years" of 1959, 1960, and 1961) and to consistently allocate a relatively high proportion of national income to productive investment. Equally important to the quality of life were the results of mass public-health and sanitation campaigns, which rid the country of most of the conditions that had bred epidemics and lingering disease in the past. The most concrete evidence of improved living standards was that average national life expectancy more than doubled, rising from around thirty-two years in 1949 to sixty-nine years in 1985 (see Mortality and Fertility; Health Care , ch. 2).