sometimes doubling
有时候翻倍
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Until the early 1970s stocks traded on a fixed commission set by the NYSE, up to 2% each way (or 4% in and out) of the total value of the shares being traded, with extra fees for smaller transactions sometimes doubling the cost.
FORBES: Stock Market Becomes Short Attention Span Theater Of Trading
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