Bitcoin fell 2.06% to $84,425 after failing to clear $87,000, as the 10-year US Treasury yield rose to 5.11%, its highest level since the 2007 global financial crisis. Higher yields reflected stronger US activity, inflation concerns linked to geopolitical tensions and oil prices, recent Federal Reserve tightening, and expectations of further rate increases after comments from Fed Governor Michael Barr. The Treasury market also faced heavier supply as US national debt exceeded $40 trillion and AI companies borrowed to fund infrastructure, intensifying competition for investor capital. China reduced its US Treasury holdings by 11% over the year. Bitcoin's immediate support stood at $83,520, with a break below that level risking a move toward $81,000. Spot Bitcoin ETF inflows reached $999 million on Monday, the largest daily inflow since October 2025, helping cushion the decline. The selloff followed stronger-than-expected September US business activity, which pushed the composite PMI to 58.4, services to 58.7 and manufacturing to 57.0, while crypto liquidations reached $135.8 million within an hour of the data. Platinum remained below $1,760 and gold below $4,300, although platinum's longer-term outlook was supported by tight inventories and rising industrial demand.