Plenty of trends last a LOT longer than just 2 years, WB! Aren't you interested in the big picture?

History provides a framework, a sense of perspective. It enables us to compare what is going on right now with previous booms and busts.

The aim is to learn from past. You do not need to have experienced previous crashes first hand to learn something from them! Human nature has not changed.

"Those who cannot remember the past are condemned to repeat it." Santayana.