Why do people use really inefficient dirty open fires to cook? Why aren't they using better stoves? It's not as if a stove requires huge amounts of resources.

Why do people use really inefficient dirty open fires to cook? Why aren't they using better stoves? It's not as if a stove requires huge amounts of resources. Or better still, why not just let them eat cake? Then they won't need stoves or fires at all! Those poor people out in third-world countries sure are silly.... Sarcasm aside, if someone can't afford a better stove they're not going to be able to afford Soylent, so it's a pretty ridiculous benefit to cite in the first place.