What is what does that have to do with the price of tea in china?

The phrase "what does that have to do with the price of tea in China" is a rhetorical question that is often used to express the irrelevance of a statement or to dismiss an argument as being unrelated to the topic at hand. It has no real connection to the actual price of tea in China and is simply a metaphorical device that is used to illustrate the idea that something is not important or relevant to the discussion. The phrase is believed to have originated in the United States in the 1920s and has since become a popular idiom in English-speaking countries.