Visual representation of our data sources and their coverage periods
📈 Coverage Summary
🔄 Merge Strategy
Priority Order: When dates overlap, we use the following priority (highest first):
Yahoo Finance - Daily data, 2025-present (highest priority, most granular current data)
World Bank - Monthly data, 1960-2024
MeasuringWorth London - Annual data, 1718-1959
MeasuringWorth British - Annual data, 1257-1717 (fills oldest historical gaps)
This provides comprehensive historical gold price data spanning nearly 800 years (1257-2025) with increasing granularity over time.
📚 Source Attribution
British Official Price (1258-1717): MeasuringWorth (annual)
Citation: Lawrence H. Officer and Samuel H. Williamson, 'The Price of Gold, 1257-1945,' MeasuringWorth, 2025
London Market Price (1718-1959): MeasuringWorth (annual)
Citation: Lawrence H. Officer and Samuel H. Williamson, 'The Price of Gold, 1718-2024,' MeasuringWorth, 2025
World Bank Commodity Prices (1960-2024): World Bank Pink Sheet (monthly)
Gold prices in USD per troy ounce
Yahoo Finance (2025-present): Gold Futures (GC=F) (daily)
Current gold futures prices in USD per troy ounce