Why is Kuwait money so expensive?

Could you explain why the Kuwaiti Dinar, as the official currency of Kuwait, is considered to be one of the most valuable currencies globally? Is it due to the country's vast oil reserves and subsequent economic stability, or are there other factors at play, such as a low inflation rate and strong government policies, that contribute to its high value compared to other currencies? I'm curious to understand the reasons behind its high exchange rate and what implications it may have on international trade and investment.