The HKD waned, triggering the weak-side convertibility undertaking of 7.85 against the USD. The Hong Kong Monetary Authority (HKMA) bought HKD equivalent to HKD3.925 billion during the New York session this morning (July 31), selling USD.The aggregate balance of the Hong Kong banking system will fall to HKD82.552 billion tomorrow (August 1). Related NewsCentral Parity of USD/ RMB Sheds 2 bps to 7.1496