Greece market places (agorai) were to be found in most city states, where they operated within the agora (open space). Between 550 and 350 BCE, Greek stallholders clustered together according to the type of goods carried - fish-sellers were in one place, clothing in another and sellers of more expensive goods such as perfumes, bottles and jars were located in a separate building. The Greeks organised trade into separate zones, all located near the city centre and known as stoa. A freestanding colonnade with a covered walkway, the stoa was both a place of commerce and a public promenade, situated within or adjacent to the agora. At the market-place (agorai) in Athens, officials were employed by the government to oversee weights, measures, and coinage to ensure that the people were not cheated in market place transactions. The rocky and mountainous terrain in Greece made it difficult for producers to transport goods or surpluses to local markets, giving rise to the kapēlos, a specialised type of retailer who operated as an intermediary purchasing produce from farmers and transporting it over short distances to the city markets. In ancient Rome, trade took place in the forum. Rome had two forums; the Forum Romanum and Trajan's Forum. Trajan's Market at Trajan's forum, built around 100-110CE, was a vast expanse, comprising multiple buildings with shops on four levels. The Roman forum was arguably the earliest example of a permanent retail shopfront. In antiquity, exchange involved direct selling via merchants or peddlers and bartering systems were commonplace. In the Roman world, the central market primarily served the local peasantry. Market stall holders were primarily local primary producers who sold small surpluses from their individual farming activities and also artisans who sold leather-goods, metal-ware and pottery. Consumers were made up of several different groups; farmers who purchased minor farm equipment and a few luxuries for their homes and urban dwellers who purchased basic necessities. Major producers such as the great estates were sufficiently attractive for merchants to call directly at their farm-gates, obviating the producers' need to attend local markets. The very wealthy landowners managed their own distribution, which may have involved importing and exporting. The nature of export markets in antiquity is well documented in ancient sources and archaeological case studies. At Pompeii multiple markets served the population of approximately 12,000. Produce markets were located in the vicinity of the Forum, while livestock markets were