a more straightforward fashion. Family and household In past Chinese society, the family provided every individual's support, livelihood, and long-term security. Today the state guarantees such security to those with no families to provide for them, and families and work units share long-term responsibility for the individual. The role of families has changed, but they remain important, especially in the countryside. Family members are bound, in law and custom, to support their aged or disabled members. The state, acting through work units, provides support and benefits only when families cannot. Households routinely pool income, and any individual's standard of living depends on the number of household wage earners and the number of dependents. In both cities and villages, the highest incomes usually are earned by households with several wage earners, such as unmarried adult sons or daughters. In late traditional society, family size and structural complexity varied directly with class. Rural landlords and government officials had the largest families, poor peasants the smallest. The poorest segment of the population, landless laborers, could not afford to marry and start families. The need to provide for old age and the general association between the numbers of sons surviving to adulthood and long-term family success motivated individuals to create various non-standard family forms. Couples who produced no sons, or no children at all, adopted or purchased infants outright. Families with daughters but no sons tried to find men willing to marry their daughters and move into their families, abandoning their original families and sometimes even their original surnames. Families with daughters but no property to attract a son-in-law were sometimes forced to sell their daughters as concubines or prostitutes. The variation in family size and complexity was the result of variation in class position and of the dual role of the household as both family and economic enterprise. In contemporary society, rural families no longer own land or pass it down to the next generation. They may, however, own and transmit houses. Rural families pay medical expenses and school fees for their children. Under the people's commune system in force from 1958 to 1982, the income of a peasant family depended directly on the number of laborers it contributed to the collective fields. This, combined with concern over the level of support for the aged or disabled provided by the collective unit, encouraged peasants to have many sons. Under the agricultural reforms that