An analysis report shows that, in 2008, the national average sales price of commercial housing approached the 4000-yuan mark, reaching 3919 yuan per square meter. In 2008, the per capita disposable income of urban residents in our country was 15781 yuan. This means that if urban residents did not spend anything for a whole year, they could only afford to buy 4 square meters of commercial housing. At the same time, this report shows that in 2001, the average price of commercial housing in our country was still around 2170 yuan per square meter, but by 2008, it had risen by more than 1700 yuan, an increase of over 80%. Annual salary = 4 square meters. The "Analysis Report on the Land Price Situation in Major Cities Nationwide in 2008" issued by a department under the Ministry of Land and Resources points out that since 2001, the price of commercial housing in our country has been showing a gradual upward trend. The report shows that after experiencing a housing price increase of less than 5% in 2002 and 2003, in the following two years, housing prices entered the "fast lane", with the growth rate of the national commercial housing price reaching as high as 17.76% and 14.04%, respectively. In 2007, with the overheated investment in real estate, the national housing price also rose by 14.76%, reaching 3864 yuan per square meter. However, in 2008, the momentum of rising housing prices slowed down, with the national average commercial housing sales price growth rate at 1.42%, a decrease of 13.96 percentage points compared to the previous year. But the national average housing price still rose to 3919 yuan per square meter. In 2008, the per capita disposable income of urban residents in our country was 15781 yuan. Calculating from this, an urban resident who does not engage in any other consumption within a year can only afford to buy 4 square meters of commercial housing.