What is the most powerful currency index in the world?
Could you elaborate on what you mean by the "most powerful currency index in the world"? Are you referring to the one with the highest trading volume, the widest range of currencies covered, or perhaps the one that is most influential in determining the value of other currencies? Each of these factors could potentially lead to a different answer, so it would be helpful to have a clearer idea of what you're looking for. Additionally, it's worth noting that the strength of a currency index can vary over time based on a variety of factors, such as economic conditions, political stability, and investor sentiment.
What is the rarest British coin in the world?
Can you elaborate on the characteristics of the rarest British coin in the world? Are there any specific features that make it stand out from other coins, such as its minting year, denomination, or design? Furthermore, what factors contribute to its rarity, and how does it compare to other rare coins from around the globe in terms of value and historical significance?