Which of the following statements is correct?
1. Europe has always been much wealthier than Africa.
2. Life expectancies have not changed a great deal in the last 1000 years.
3. The Industrial Revolution initially started in China.
4. Average incomes hardly changed between 1 A.D. and 1000 A.D.
Answer: 4. Average incomes hardly changed between 1 A.D. and 1000 A.D.