/kɒst ʌv fʌndz ˈɪndɛks/ – Phrase
Definition: Chỉ số chi phí vốn.
A more thorough explanation: the average interest paid by financial institutions in a certain region, which is used as a base for calculating interest rates for certain mortgages (=agreement to borrow money to buy a house)
Example: In March, COFI landed at 0.8 basis points less than it did at the end of February.