The Importance of Energy in the Economy

In developed nations, nobody builds their own home or grows their own food unless they have a personal passion for doing so. University education was extremely rare and few professions even existed other than the most essential ones such as law and medicine. Housing hadn't been invented yet and human slaves were the primary source of work needed to operate farms and plantations which provided the food supply. Please ask yourself why it is that for about 200 years now, society has advanced much more quickly than it did for centuries before that.