When people in richer countries buy a lot of solar panels and heat pumps and whatnot, that brings down the manufacturing cost of these items, so that they also

When people in richer countries buy a lot of solar panels and heat pumps and whatnot, that brings down the manufacturing cost of these items, so that they also become the rational choice in poorer countries. Once everyone in America started driving cars, that didn't drive a resurgence in the use of horses for transportation in Africa.