Purchased in 1974. Spine and inner pages show age-related deterioration. Cover and bottom edge have stamps. The following are my personal observations. The biggest keyword is "human." Not "people." Shakespeare is said to have highlighted two attributes of money: (1) Money is a visible god... (2) Money is a common prostitute... It's understandable why Chinese people burn paper money as incense, and why statues of gods are covered in paper money. Paper money is also a bond certificate. US debt is $23 trillion. Gasoline price is $3.2 per gallon. Annual consumption is 376 million gallons, equivalent to $12 trillion. This is half of the national debt. The number of vehicles owned is 289 million. Each vehicle consumes only 1 gallon. The statistical data is incorrect.