[判断]Because there are many buyers and sellers in a perfectly competitive market, no one seller can influence the market price.
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[判断]Because nothing can be done about sunk costs, they are irrelevant to decisions about business strategy.
A. 对
B. 错
[判断]A firm will shut down in the short run if revenue is not sufficient to cover its variable costs of production.
A. 对
B. 错
[判断]A firm operating in a perfectly competitive market earns zero economic profit in the long run but remains in business because the firm’s revenues cover the business owners’ opportunity costs.
A. 对
B. 错
下列各项属于股票投资优点的有( )。
A. 能降低购买力的损失
B. 流动性很强
C. 投资风险低
D. 收入稳定性强