Final answer:
The change in real income for the average person in Western Europe was much smaller from the Year 1000 to Year 1800 compared to the period from 1870 to today, which saw a significant increase in purchasing power due to the Industrial Revolution.
Step-by-step explanation:
The change in real income (adjusted for inflation) for the average person in Western Europe from the Year 1000 to Year 1800 was a small gain which was much less than the change in real income from the Year 1870 to today.
The Industrial Revolution in the late 19th century led to a significant increase in the average person's purchasing power. Goods became cheaper to produce, resulting in a better quality of life and the ability to afford non-essential items like consumables and periodicals.
In contrast, the change in real income in Western Europe from the Year 1000 to Year 1800 was relatively small and did not experience the same level of economic growth as the later period.