Given the timelines I can't see how Biden is even 10% at fault. The previous administration started trade wars which began to blow up supply chains even prior to the pandemic. They also increased the deficit during a time of economic growth when they should have been trying to decrease it. So if anything I would break down the blame like this: The Fed: 60% (for QE and keeping rates too low for way too long), Previous admin: 20% (trade wars, increasing deficits when they should've been working on reducing them), Putin 15% (for invading Ukraine), Biden admin (maybe 5%, but even that is probably a bit high)