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Before the industrial revolution most work was performed either by humans or animals. Some civilizations managed to harness water power but this was never really that widespread. The standard of living back then was atrocious compared to our current levels, so what gives? Why are we so well off when they were not? ### IT'S NOT ABOUT THE MONEY There is a lot of money floating around the modern economy but our prosperity has nothing to do with money. It all has to do with the amount of surplus energy available for use in the modern era. Five months ago I wrote a post in which I calculated that the average human generates about 170 watts of power all day, every day. If you are interested you can read it here: [How Many Watts Of Power Does Your Body Generate?](https://steemit.com/physics/@procrastilearner/let-me-do-the-math-for-you-how-many-watts-of-power-does-your-body-generate) 170 watts of power is really not that much, enough to power a few incandescent light bulbs but not really enough to power even a small motorcycle. It gets worse as this is the power required for just your basic metabolic functions. If you wanted to do actual physical labour (like dig a ditch) over a long stretch of time then maybe 100 watts is achievable at a sustained rate if you are in good shape. In all likelihood the sustained power output for an 8 or 10 hour work day is probably closer to 50 watts, less if the person is out-of-shape or lazy.

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### GLOBAL ENERGY OUTPUT Humans love energy. Coal energy, oil energy, natural gas energy, hydroelectric energy. nuclear energy, photo-voltaic energy and more. We use this energy to power our cars, trucks, tractors, ships, airplanes and factories. The estimated amount of global energy consumption per year in 2013 was 1.6 x 10¹⁷ Wh (watt-hours). There are 3600 seconds in an hour so this converts to 5.76 x 10²⁰ Ws or 5.76 x 10²⁰ joules. Assuming there are about 7 billion people on this Earth that is 81 billion joules per person per year. A watt is a joule per second and there are 31,536,000 seconds per year so this comes out to about 2600 watts of power are being used 24 hours a day, 7 days a week for each person. This is for the developed world of course. For developing countries that number is much lower.

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### YOUR PERSONAL ENERGY SLAVES So, if you live in the developed world you have at your disposal 2600 watts of power output to make all of the things that you want: food, clothes, cars, bicycles, iPhones and even computer servers to deliver to you your favourite blog on Steemit. At the start of this post we learned that a person generates about 170 watts in metabolic output just to live and maybe only an additional 50 watts of power for actual manual labour. This means that the 2600 watts of power being output just for you is roughly equivalent to having 52 slaves working 24 hours a day seven days a week. Of course these "slaves" are actually automated machines running engines and motors and churning out the products that you love. This ratio of 52 to 1 is therefore the real reason that people in the developed world currently live so very comfortably. We can sit in Starbucks on a lazy afternoon, drinking a coffee, eating a snack and surfing the social media in air conditioned comfort all because of this ratio. ### CLOSING WORDS

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So in essence we are not prosperous because of all the money floating around the world (money is just a marker for wealth). We are prosperous because of the huge energy surplus producing goods and services for the global economy. When adding up all of the energy used in the world it turns out that each person is the beneficiary of 2600 watts of power output 24 hours a day and 7 days a week. Thinking about it another way, that 2600 watts is roughly equivalent to having 52 people working for you all day long. In the past, only the kings of old could ever corral that much power output to themselves but we are better off because not even ancient kings had air conditioning. Postscript In blog posts on topics like this, it is very natural to start thinking about the disparities between the developed and the developing world. The antidote to that type of thinking is this lecture by Hans Rosling - [The best stats you've ever seen.](https://www.youtube.com/watch?v=hVimVzgtD6w) In this lecture he talks about the statistics of the developing world and the massive numbers of people that have been brought out of poverty in our modern era. Watch it, you will come out at the end optimistic about a better world in the future. *Thank you for reading my post.* ### POST SOURCES [World Energy Consumption](https://en.wikipedia.org/wiki/World_energy_consumption) [Hans Rosling - The best stats you've ever seen.](https://www.youtube.com/watch?v=hVimVzgtD6w) [Gapminder: Unveiling the beauty of statistics for a fact based world view](https://www.gapminder.org/)