Business Insider (Tobias Levkovich): - ... the equity market has been linked quite tight with oil prices over the past five years, thereby making the recent divergence a bit more interesting. We suspect that some of the difference may be coming from the new developments in the US energy industry tied to technologies allowing for more deepwater drilling, horizontal drilling, shale gas and tight oil... When running a regression of the absolute levels over the past 3 years, one would obtain an R-squared of 0.8 (correlation of 0.9) between the WTI futures and the S&P500. Clearly both are highly correlated to the US economy and the energy sector is a sizable component of the US equity market (about 13% of the S&P500). That is why this recent divergence between the two asset classes really stands out (chart below).
|WTI vs S&P500 (3 years, daily)|
Levkovich may be right about the changes taking place in the US energy industry. Declining global demand can also explain the divergence between the two. But these types of changes are generally far more gradual than this sharp dislocation we've experienced recently. Once could therefore potentially conclude from this chart that either WTI has sold off way too sharply recently or the US equities may be overvalued.