The weight discrepancy between a pound of gold and a standard pound arises from the different measurement systems used for precious metals versus everyday goods. Gold, along with other precious metals, is typically weighed using the troy system, while common items are weighed using the avoirdupois system. A troy pound consists of 12 troy ounces, whereas an avoirdupois pound contains 16 avoirdupois ounces.
This convention stems from historical practices and standardization efforts within the precious metals industry. The troy system offers a finer level of granularity for valuing these commodities, which are traded at high prices and require precise measurement. Using this system ensures consistent and accurate valuation across global markets. The historical context of trade and commerce played a significant role in establishing this standard within the gold market.