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<p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica,Arial,sans-serif;font-weight:normal;text-align:justify;hyphens:auto" data-flag="normal" lang="en">引子</p><p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica, Arial, sans-serif;font-weight:normal;text-align:justify" data-flag="normal" lang="en">人生一世，所为何物？不可缺衣食富足！</p><p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica, Arial, sans-serif;font-weight:normal;text-align:justify" data-flag="normal" lang="en">既然是资源缺、欲无度、先哲忧，唯有贸易。</p><p style="font-size:16px;color:#333333;line-height:30px;font-family:Helvetica, Arial, sans-serif;font-weight:normal;text-align:justify" data-flag="normal" lang="en">依禀赋、共享着劳动分工的四方物。</p>