The recent plunge in oil prices has brought into question the generally accepted view that lower
oil prices are good for the United States and the global economy. In this paper, using a quarterly
multi-country econometric model, we first show that a fall in oil prices tends relatively quickly to
lower interest rates and inflation in most countries, and increase global real equity prices. The
effects on real output are positive, although they take longer to materialize (around four quarters
after the shock). We then re-examine the effects of low oil prices on the U.S. economy over
different sub-periods using monthly observations on real oil prices, real equity prices and real
dividends. We confirm the perverse positive relationship between oil and equity prices over the
period since the 2008 financial crisis highlighted in the recent literature, but show that this
relationship has been unstable when considered over the longer time period of 1946–2016. In
contrast, we find a stable negative relationship between oil prices and real dividends which we
argue is a better proxy for economic activity (as compared to equity prices). On the supply side,
the effects of lower oil prices differ widely across the different oil producers, and could be
perverse initially, as some of the major oil producers try to compensate their loss of revenues by
raising production. Taking demand and supply adjustments to oil price changes as a whole, we
conclude that oil markets equilibrate but rather slowly, with large episodic swings between low
and high oil prices.
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