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But wealth had another advantage, too. Not only could it buy wives directly, it could also buy "power." It is noteworthy that it is hard to distinguish between wealth and power before the time of the Renaissance. Until then there was no such thing as an power economic sector independent of the power structure. A man's livelihood and his allegiance were owed to the same social superior. Power is, roughly speaking, the ability to call do your bidding, and that depended strictly on wealth (with a little help from violence).
The Red Queen
Matt Ridley
In multicellular organisms, stem cells are undifferentiated or partially differentiated cells that can differentiate into various types of cells and proliferate indefinitely to produce more of the same stem cell. They are the earliest type of cell in a cell lineage. They are found in both embryonic and adult organisms, but they have slightly different properties in each. They are usually distinguished from progenitor cells, which cannot divide indefinitely, and precursor or blast cells, which are usually committed to differentiating into one cell type.
Stem Cell - Wikipedia
en.wikipedia.org
The freshman's dream is a name sometimes given to the erroneous equation {\displaystyle (x+y)^{n}=x^{n}+y^{n}}, where {\displaystyle n} is a real number (usually a positive integer greater than 1) and {\displaystyle x,y} are nonzero real numbers. Beginning students commonly make this error in computing the power of a sum of real numbers, falsely assuming powers distribute over sums.[1][2] When n = 2, it is easy to see why this is incorrect: (x + y)2 can be correctly computed as x2 + 2xy + y2 using distributivity (commonly known by students as the FOIL method). For larger positive integer values of n, the correct result is given by the binomial theorem.
Freshman's Dream - Wikipedia
FOIL method
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