Antigua does accept American dollars, but that is it. Antigua does not accept Euro's, Chinese currency, Indian currency, etc. before coming to Antigua you should change it all to American.
Hyperinflation in Zimbabwe reduced it to one of the lowest-valued currency units in the world, so I think there is no country that accepts its currency.
Yes, Switzerland does not accept euros as a form of currency. The official currency of Switzerland is the Swiss Franc (CHF).
Expired foreign currency can often still be exchanged or redeemed at banks or currency exchange services, although policies vary by institution and country. Check with your local bank to see if they accept expired notes. Alternatively, consider donating the currency to charities that accept foreign currency, or use it for educational purposes, such as teaching about different cultures or economics. Lastly, some collectors may be interested in old currency as a collectible item.
West African CFA Franc is the local currency but some hotels also accept euros.
Pound
No, they don't.
The Omani Rial (OMR) is the official currency of Oman.Oman uses the Rial (OMR)
Currency gets its Power from the People who accept it. If you lose faith in the ability of the Government to stand behind a currency its value decreases, or can become ZERO. If you want to buy something from me and I refuse to accept your Currency, and demand Gold, what is the Currency's value...well Zero for this transaction.
Legal tender. In plain English, it's the currency that is in use in a particular country. US dollars in America, Sterling in the UK and Euros in much of Europe for example.A creditor is normally free to accept other forms of payment if he chooses to. The creditor may decide to accept a foreign currency rather than wait for the payment in the legal tender of the country. The creditor is normally not obliged to accept anything other than legal tender.
Australian Dollars ($AUD). It would be very unusual for a shop to accept other currency, perhaps tourist shops or airport shops may accept USD, EUR or GBP.
Bolívares are the official currency of Venezuela, and they are primarily used within the country for everyday transactions. Cashing or exchanging bolívares typically occurs at banks, currency exchange offices, or through informal markets, especially given the high inflation and currency devaluation in Venezuela. Additionally, some international businesses and tourist services may accept bolívares, but their acceptance is limited outside the country.