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==Economics and technological development== ...probably do a lot better by concentrating on the making of arrowheads and barter for his other needs. Clearly, regardless of the goods and services bartered

Although [[barter (economics)|barter]] was used in ancient Rome, and often used in tax collection, Rome had a ve

...I had to guess whether Wikipedia or the median refereed journal article on economics was more likely to be true, after a not so long think I would opt for Wikip ...age professional services billing rate for photography exceeds the nominal barter and volunteer rate, so we have to consider the user to be a sole proprietor