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Weighing technology was invented around 3000 BCE between Mesopotamia and Egypt and became widely adopted in Western Eurasia within ∼2,000 y. For the first time in history, merchants could rely on an objective frame of reference to quantify economic value. The subsequent emergence of different weight systems goes hand in hand with the formation of a continental market. However, we still do not know how the technological transmission happened and why different weight systems emerged along the way. Here, we show that the diffusion of weighing technology can be explained as the result of merchants’ interaction and the emergence of primary weight systems as the outcome of the random propagation of error constrained by market self-regulation. We found that the statistical errors of early units between Mesopotamia and Europe overlap significantly. Our experiment with replica weights gives error figures that are consistent with the archaeological sample. We used these figures to develop a model simulating the formation of primary weight systems based on the random propagation of error over time from a single original unit. The simulation is consistent with the observed distribution of weight units. We demonstrate that the creation of the earliest weight systems is not consistent with a substantial intervention of political authorities. Our results urge a revaluation of the role of individual commercial initiatives in the formation of the first integrated market in Western Eurasia.

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The article presents a new picture of sword fighting in Middle and Late Bronze Age Europe developed through the Bronze Age Combat Project. The project investigated the uses of Bronze Age swords, shields, and spears by combining integrated experimental archaeology and metalwork wear analysis. The research is grounded in an explicit and replicable methodology providing a blueprint for future experimentation with, and wear analysis of, prehistoric copper-alloy weapons. We present a four-step experimental methodology including both controlled and actualistic experiments. The experimental results informed the wear analysis of 110 Middle and Late Bronze Age swords from Britain and Italy. The research has generated new understandings of prehistoric combat, including diagnostic and undiagnostic combat marks and how to interpret them; how to hold and use a Bronze Age sword; the degree of skill and training required for proficient combat; the realities of Bronze Age swordplay including the frequency of blade-on-blade contact; the body parts and areas targeted by prehistoric sword fencers; and the evolution of fighting styles in Britain and Italy from the late 2nd to the early 1st millennia BC. All primary data discussed in the article are available as supplementary material (Appendix) so as to allow scrutiny and validation of the research results.

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