Investors might be less bullish if the 27-year-old Mark Zuckerberg, the founder, were in sole charge.
如果27岁的创始人Mark Zuckerberg是唯一的负责人，那么投资人可能就不会看涨。
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Every retailer has to charge a mark-up to cover overheads, and faces a tension between the immediate pressures of competition and the need to stay in business.