更深层的转型，是工具化与服务化。平台不再仅仅因为撮合了一单交易而收费，而是围绕效率提升提供系统、工具与算法能力。当平台开始以管理系统、调度算法、数据分析等方式收费，其角色也随之从中介转向基础设施。
bookkeeping was surprisingly labor-intensive in even the bank of the 1950s.
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int n = sizeof(arr)/sizeof(arr[0]);
const sb = _apply.call(origAddSB, this, arguments);