FIGURE 9.47 Average monthly expenditures for a Japanese worker?’s family, 2011. The average Japanese worker’s household has 3.42 people, with the household head, at just over 47 years old, as the primary earner. The average household income is U.S.$6267.11, and the average monthly expenditures are U.S.$3794.24. The surplus goes to taxes, savings, debt, insurance, and related items.