@jwinnie microprocessors. medicine. efficiency.
if you need 100 arrowheads it's better to make a mold and melt some iron, than to make them individually.
it's more efficient to print a thousand books after you've built a printing press
or try making a medical implant.
or an MRI scanner. idk how you'll even build the tools that will let you build it.
@grainloom I haven't read it and I'm not familiar with what his arguments are, but Kevin Carson wrote a whole book on alternatives to economies of scale: http://apw.org.nz/wp-content/uploads/2015/06/HomeBrewRevolution_Carson.pdf
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