The guilds, banks, and money systems, which began in medieval europe,
discouraged european exploration
contributed to decreased trade
were the start of modern market economies and trade unions
were ultimately rejected by europe in favor of colonialism

The guilds , banks , and money system which began in medieval europe : Were the start of modern market economies and trade unions

Before the bank and money system, the merchants have to pay their goods with another goods in a barter system. This often create some dispute because of 'unfairness' . The money system allowed one specific currency as a standard to exchange goods and services and eliminate this unfairness

hope this helps

Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160