To regulate the more important crafts, a system of guilds evolved in the towns. Each guild covered a single craft. Their main responsibility was setting rules of production and, to some extent, sale. So, for example, all shops in a guild might have to be on the same street to allow buyers to compare products and to make sure the rules of production were followed. The guilds also set production standards; for example, a chandlers guild (candle makers) would set a minimum weight for the candles and a minimum percent of animal fat in the wax. To do so was particularly important for crafts that
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