Economics

For sure, it's an enjoyable kind of challenge. I also find some aspects of the language are actually easier than other languages I've learned. Not having conjugation is really nice since you just learn the word once, and the grammar is generally pretty straight forward. I got flustered about the tones at the start, but then just learned not to worry about it. People will understand you from the context even if you screw the tones up. Writing is the hardest part, but it's just a matter of repetition in the end.