<Ul> <Li> Yucatán </Li> <Li> Chiapas </Li> <Li> Guatemala </Li> <Li> Petén </Li> </Ul> <Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Trade in Maya civilization was a crucial factor in renaming Maya cities . The economy was a mixed capitalist / command system combining free market trade and direct government control over areas considered vital to the population of any specific state . </P>

How did commerce contribute to the success of the maya urban centers