That's a really good question. I don't have a data-driven answer. I think that its a mix, to be honest - you have to have grit to get through education in the U

That's a really good question. I don't have a data-driven answer. I think that its a mix, to be honest - you have to have grit to get through education in the US, and success comes via grit quite often. But you can have grit and not an education.