Nominal US Dollars, not PPP adjusted, not inflation adjusted.
Resolves prob to 10*((world gdp 2100 / world gdp 2023)^(1/77)-1)
If dollars cease to exist during the interval, I'll use the next largest fiat currency at the last available exchange rate from dollars to that currency.
(e.g., if 1 USD = 4 Yuan just before the dollar ceases to exist, then the 2100 world gdp will be measured in Yuan and divided by 4 to convert it to the dollars that no longer exist)