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Indeed, the IMF downgraded its 2021 US growth forecast on Tuesday by one percentage point, the most for any G7 economy. The IMF cited supply chain disruptions and weakening consumption — which itself has been partially driven by supply chain bottlenecks such as a lack of new cars amid the computer chip shortage.

“Border controls and mobility restrictions, unavailability of a global vaccine pass, and pent-up demand from being stuck at home have combined for a perfect storm where global production will be hampered because deliveries are not made in time, costs and prices will rise and GDP growth worldwide will not be as robust as a result,” Moody’s wrote in the report.

Moody’s said the “weakest link” may be the shortage of truck drivers — an issue that has contributed to congestion at ports and caused gas stations in the United Kingdom to run dry. Unfortunately, Moody’s warned there are “dark clouds ahead” because several factors make overcoming the supply constraints particularly challenging.