Aeconomic system can be characterized by some government involvement and private ownership of most business.
-free
-mercantile
-mixed
-market

Generally speaking, a "mixed" economic system can be characterized by some government involvement and private ownership of most business, since some government regulation ensures the protection of the consumers. 

These islands/chinampas then provided rich soil for crops with easy access to water. i hope this is correct, im so sorry if its not !