How much will $1.00 US dollar buy in North Korea?

I'm curious to know, given the unique economic landscape of North Korea, how much purchasing power does one US dollar hold? Specifically, if I were to bring $1.00 into the country, what goods or services could I realistically expect to acquire with that amount? Is there a significant difference in exchange rates or purchasing power compared to other currencies, and if so, how does this affect the overall cost of living for citizens there?