can you provide some details about the trade of that time?
Trade was a key component of Maya society, and in the development of the Maya civilization.
Maya civilization
Trade was a key component of Maya society, and in the development of the Maya civilization. 
who held the power in the maya civilization The king. when did this civilization develop? 2600 BC. which materials and technology are used by the people of that time to build their cities? Neolithic technology; stone, limestone, volcanic tuff, sandstone and fired bricks. which was the common language spoken at that time? Proto-Mayan. any museum in which artefacts of that time are preserved? Yes, there are. can you mention the region where this civilization developed? Southeastern Mexico and northern Central America. did this civilization also build pyramids? Yes.
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Maya civilization [SEP] Trade
Trade was a key component of Maya society, and in the development of the Maya civilization. The cities that grew to become the most important usually controlled access to vital trade goods, or portage routes. Cities such as Kaminaljuyu and Qʼumarkaj in the Guatemalan Highlands, and Chalchuapa in El Salvador, variously controlled access to the sources of obsidian at different points in Maya history. The Maya were major producers of cotton, which was used to make the textiles to be traded throughout Mesoamerica. The most important cities in the northern Yucatán Peninsula controlled access to the sources of salt. In the Postclassic, the Maya engaged in a flourishing slave trade with wider Mesoamerica.