政府认为它可以利用货币政策和财政政策来实现一定的产出水平。如果发生下列情况。你建议政府采取哪种政策: a.技术进步提高了资本的边际生产率; b.人们预期未来收入会有增长; c.信用卡的应用提高了货币周转率; d.人们预期未来税收将会增加。 The government thinks that it can use monetary and fiscal policies to achieve a certain level of output.Which policies would you recommend it to implement if the following events occur: a.A technological improvement raises the marginal productivity of capital. b.People expect an increase in their future income. C.The introduction of credit cards increases the velocity of money. d.People expect a rise in taxes in the future.