Most Traded Currencies

Hong Kong and Macau are Special Administration Regions of China. When they were absorbed into China, the PRC government didn't want to collapse the local economies. They knew they had a good thing going there so they gave them significant autonomy. Hong Kong has it's own customs and border controls, as well. You don't need a Chinese visa to visit Hong Kong. And the government was largely very autonomous, too, though recent efforts by Beijing to meddle in local politics have been the cause of large protests.

I've still got a few old HK dollars with the Queen on the back from when I lived there before 1997. She's gone now, but the currency has endured. Despite Beijing's steady encroachment that Kalbahamut mentioned, for the most part HK and Macau function as independent states. HK's Basic Law is essentially it's own mini-constitution and it maintains its own border controls, and, as mentioned, currency. Additionally it fields its own teams in many sporting competitions. Identity is a tricky thing in HK, but at least when I was there last (a while ago now - not since about 2008) they thought of themselves as HKers first and Chinese very much second.

That's what happens when you take a quiz in the first 20 minutes. 34/35 only beats 85.1% at this point.

Yeah, like the fact that Sweden doesn't use the euro.

The value of these currencies are almost all pegged to or at least closely related to the value of the US dollar because, since the oil industry began in Pennsylvania and has been dominated by the US ever since (formerly in supply, currently in demand)- the price of a barrel of oil has always been in US dollars. So... these countries do almost all of their relevant business in US dollars. The local currencies are just that: local. I know from first hand experience taking a lot of Saudi riyals overseas somewhere and trying to exchange them is a horrible idea and you'll take a big loss because nobody wants riyals. Much better to convert to USD in Saudi first, and then exchange the dollars upon arrival. The only time these currencies are traded is when Saudis go to neighboring GCC countries and vice versa, but those neighboring countries are all tiny so this doesn't amount to much.

Each trade of currency has to involve 2 currencies, so they should add up to almost 200%. Which they do.

Neither is Eurozone, but both of them have their own currency that is widely traded, so they count.

Call what the dollarzone? There's no such thing. As opposed to the Eurozone, which is a thing. The EU is not Europe. Not all countries in the EU use the Euro. And some countries not in the EU belong in the Eurozone. The group of countries that use the Euro are called the Eurozone, though there are other countries (Kosovo, Montenegro) that use the Euro that are not part of the Eurozone, just like there are other countries that use US dollars that are not part of the United States.

Or "crown", since that's what they mean.

I remembered South Korea and won easily

Renminbi = CNY

Translations of the same word - but the currencies are separate - like the dollars.

Different currency

I think its because they count as the Eurozone

Gold is more of a commodity than an actual currency. Unless you're referring to Zimbabwe Gold, which definitely pales in comparison to the currencies listed.

Beans

Switzerland is one big treasury

For one thing, there are loads of Swiss banks operating from Switzerland but controlling the money in Europe, USA, Middle East etc.

Second thing is that the Swiss Franc is seen as a safe haven currency, meaning a lot of high net-worth individuals hold Swiss-Francs to keep a stable cash component.

Agreed