3647
As stated , while Bronze Age economy was based on the exploitation and exportation of mineral local resources , tin and copper and on mass production and long range distribution of prestige items , Iron Age economy was based on an economy of necessity goods , as most items and productions were obtained " in situ " , or interchanged thought short range commerce .
 Bronze Age, Iron Age
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Bronze Age, Iron Age