It's not their choice--they might like to advertise -but they can't without running afoul of the SEC.
他们也不想这样...他们也想登广告,但是不可以登,否则会与证交会起冲突
耶鲁公开课 - 金融市场课程节选
They're always cheaper, because they don't advertise
它们总是更便宜,因为他们不做广告。
广告和价格的关系 - SpeakingMax英语口语达人
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