Offer your thoughts or opinion on the input financial query or topic using your financial background.

What did John Templeton mean when he said that the four most dangerous words in investing are: ‘this time it’s different'?
To play devil’s advocate to much of what has been written before, it's also worth noting that this is quite an important quote for a sort of reverse reason to what has been discussed before us, that of that fact that virtually every economic situation is different. As it's such a reflexive problem, each and every set of exact circumstances is always different from before. Technology radically changes, monetary policy and economic thinking shift, social needs and market expectations change and thus change the very fabric of markets as they do. It's only in its most basic miss projections of growth that economics repeats, and much like warfare, has constant shifts that radically change the core assumptions about it and do create completely new circumstances that we have to struggle to deal with predicting. People betting on the endless large scale mechanised warfare between western powers continuing post nuclear weapons would have been very, very wrong for example. That time it actually was different, and this actually happens with surprisingly often in finance in ways people quickly bury in the memories and adopt to the new norm. Remember when public ownership of stock wasn't a thing? When bonds didn't exist? No mortgages? Pre insurance? These are all inventions and changes that did change the world forever and were genuinely different and have been ever since, creating huge structural changes in economies, growth rates and societies interactions.  As the endless aim of the game is predicting growth well, we often see people/groups over extend on one new thing, and/or under extend on another as they struggle to model these shifts and step changes.  Talking as if the fact that people do this consistently as if it is some kind of obvious thing we can easily learn from (or easily take advantage of) in the context of such a vague and complex problem could be argued to be highly naïve and largely useless. This time it is different. Last time it was too.