If you're asking by what definition of "hotter", the answer is "by sales demand". But that's the entirety of the article. If you're asking "how", I think you an

If you're asking by what definition of "hotter", the answer is "by sales demand". But that's the entirety of the article. If you're asking "how", I think you answered it in the last three words of your post ("except for price"). "Under the hood" doesn't matter as much with these items for now.