Which groups of people most directly benefited from song innovations in the song dynasty‘s open border policy?

Merchants and farmers benefited from this policy.

Merchants became able to trade with other people and increased their numbers of consumers because they could leave the borders of the Song. They also benefited by bringing foreing goods.

Farmers benefited from this policy because they had the possibility to sell their products in a bigger market.

the money supply is the total amount of money available in the economy. how do changes in the money supply affect people and businesses?

answer; self-efficacy;