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Suppose I told you there was a "pin" which burst every major economic bubble of the industrial age. And suppose that "pin" left a signal in data preceding the ensuing economic crash. Suppose that prior to 1929, 1973, 1980, and 2008, that "pin" appeared months and sometimes years before the crisis went mainstream.
In Breakdown: The economic impact of peak oil, Tim Watkins argues that the "pin" was a shortage of the world's primary energy source. In 1927, a global coal shortage caused prices to spike upward, raising costs across the economy and - particularly in the USA - bringing the boom of the "roaring twenties" to an end. The 1929 Wall Street crash and the Great Depression of the 1930s followed. In the late 1960s, as US oil production reached its peak, the Texas Railroad Commission cartel lost its ability to fix world prices. As the oil price rose, inflation hit those western states which had been deficit spending on everything from social programs to wars. The consequence was the end of the post-war currency system and the arrival of the OPEC cartel, whose October 1973 oil embargo gave the west - which was a lot less dependent on oil in those days - a taste of how difficult life would be if the oil stopped flowing. In 1979, it was the Iranian Revolution and the Iran-Iraq War (not St. Paul Volcker) which drove oil prices up, triggering the depression which brought inflation (but not stagnation) to an end.