Indeed, I've read much concern over this area as oil collapsed so it does merit a warning. From ZeroHedge:
The S&P 500 Energy sector stocks are down over 12% year-to-date, tumbling over 3% today to fresh 20-month lows. The spread (or risk) of high-yield energy credits surged again today, breaking above 850bps for the first time... The overall high-yield credit market is being dragged wider by this contagion as hedgers try to contain the collapse that is possible. For now, the S&P 500 remains entirely ignorant of the fact that over a third of its CapEx was expected to come from this crushed sector...
According to DB
US private investment spending is usually ~15% of US GDP or $2.8trn now. This investment consists of $1.6trn spent annually on equipment and software, $700bn on non-residential construction and a bit over $500bn on residential. Equipment and software is 35% technology and communications, 25-30% is industrial equipment for energy, utilities and agriculture, 15% is transportation equipment, with remaining 20-25% related to other industries or intangibles. Non-residential construction is 20% oil and gas producing structures and 30% is energy related in total. We estimate global investment spending is 20% of S&P EPS or 12% from US. The Energy sector is responsible for a third of S&P 500 capex. 35% of S&P EPS from investment and commodity spend, 15-20% US
In short, while nobody knows just how many tens of billions in US economic "growth", i.e., GDP, will be eliminated now that energy companies are not only not investing in growth spending or even maintenance, being forced to shut down unprofitable drilling operations and entering spending hibernation territory, the guaranteed outcome is that US GDP is set to slide as the CapEx cliff resulting from Brent prices dropping below the $75/bbl red line under which shale is broadly no longer profitable will offset any GDP benefit unleashed from the "supposed" increase in consumer spending.