It analyses thousands of years of history and it identifies that there is a 80 year cycle, starting from the premise that generations create history and history creates generations. So our next turning is in 2030s. Last was in 1940s, remember WW2 and the Breton Woods system, it just turned 80 years old. So BTC monetary system might be the next thing if we have a successful Fourth Turning. Lyn Alden was also quite into this pattern and it complements really well Broken Money.