Energy is what goes into creating jobs that pay well. Goods are made with a combination of (human labor + supplemental energy).
If supplemental energy is rising relative to human labor, we are in good shape. Human labor can be leveraged with more and more tools of various types, such as computers and bigger trucks. If supplemental energy is falling relative to labor, we end up with an increasing proportion of low-paid service jobs. Lots of greeters at Walmart, but not much else available for jobs.
We need jobs that pay well is what give rise to “demand.” A person with a job that pays well can afford new cars and often a larger home. Also, that person can afford to have children. A family that has only one child ultimately leads to a situation with less demand, because one person, on average uses less resources than two or more.
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