Collateral lowers a lender's risk, so pledged loans carry lower rates. The best collateral is stable and easy to sell, which is why government bonds dominate. If its value falls the lender demands more, and failure to post it forces a sale. That is the channel through which one drop feeds the next in a stressed market.
Awaiting gradingOn July 31 the New York Fed sold euros to buy yenScore on the Fed's H.4.1 released August 6 (as of August 5): dollars borrowed by foreign monetary authorities against Treasuries moving off zero counts as the FIMA route opening, staying at zero counts as the original expectation missing.
Awaiting gradingWhy did the Kospi fall another 8% on the day JPMorgan said the forced selling was nearly done?KOSPI jumped a record 17.91% on 7/31, but foreign and institutional selling resumed on 8/3, sending Samsung/SK hynix down another 7-8% and KOSPI down ~3.6%. The reversal within days makes it too early to tell whether this is the tail of the liquidation or fresh selling. Score after another 1-2 weeks once the swings settle.