Changes in lifestyle (consumer society, technological progress, changes in the labor market ...) over the last 45 years (1964-2009) have had a substantial impact on the structure of household budgets: the share of expenditures on food and clothing were reduced in favor of all other categories of goods and services except household furnishings and equipment which are growing at the same rate as total consumption. However, these changes are much more important in the poorest households than for the wealthier ones.