Answer: They standardized weights and coins
Explanation: The Greeks standardized weights and coins as part of their efforts to make trade easier across their colonies and trade routes. This system of standardized weights and measures allowed merchants to conduct trade across different regions using a common system, which facilitated commerce and helped to create a more unified Greek economy. The Greek system of coinage was also an important development, as it provided a standardized form of currency that was widely recognized and accepted throughout their territories, making it easier to conduct trade and exchange of goods.