Good day, could you please clarify your query about the validity of the Hong Kong Dollar (HKD)? Are you referring to its acceptance as a legal tender in Hong Kong, or perhaps its stability and use in the global financial market? If you're concerned about the HKD's future value or usability, perhaps we could discuss the current economic landscape and the Hong Kong Monetary Authority's policies to maintain the currency's peg to the US dollar. Is there a specific aspect of the HKD's validity that you'd like to delve into?