We previously examined 240 years of US market history for a sense of 'trend' or sustainability but some were not satisfied. In order to get a truly long-term perspective, we reach back 1000 years to The Middle Ages and look at how stock prices, interest rates, commodity prices, and gold have changed in a millennia (and most notably how the key historical events have shaped those price changes).
Western Markets Since The Middle Ages
The Gold Price
@Macro_Tourist for these increble charts
And just for good measure, perhaps the most important chart going forward - Nothing lasts forever... (especially in light of China's earlier comments )