How many shopping expenses in your income? How much is scale?
February 26, 2011 8:05am CST
The people from different countries has different income. Developed countries have high wealth, so their people can obtain high income averagely. Meanwhile, developping countries have middle wealth, so the people in these countries have middle income averagely. As well as, the people who live in poor countries have low income averagely. Above three income, how much scale is for different income?