2. **How do central banks determine the design and imagery that appear on national banknotes?
3. **What materials are commonly used in the production of banknotes, and how do they differ from traditional paper currency?
4. **How do historical and cultural factors influence the symbols and individuals depicted on a country's banknotes?
5. **What are the environmental impacts of producing and circulating banknotes, and what measures are being taken to mitigate these effects?
