12下表是历史上的部分经济要素变动表。这说明<table style="border: currentColor; border-collapse: collapse; mso-padding-alt: 0.0000pt 0.0000pt 0.0000pt 0.0000pt;" border="0" cellspacing="0" _dj="MsoNormalTable"><tbody><tr style="height: 22.95pt;"><td style="padding: 0pt 5.4pt; border: 1pt solid windowtext; width: 126.95pt; mso-border-left-alt: 1.0000pt solid windowtext; mso-border-top-alt: 1.0000pt solid windowtext; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="169">时间</td><td style="border-width: 1pt 1pt 1pt medium; border-style: solid solid solid none; border-color: windowtext windowtext windowtext currentColor; padding: 0pt 5.4pt; width: 159.15pt; mso-border-left-alt: none; mso-border-top-alt: 1.0000pt solid windowtext; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="212">经济要素的变动</td></tr><tr style="height: 22.95pt;"><td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor windowtext windowtext; padding: 0pt 5.4pt; width: 126.95pt; mso-border-left-alt: 1.0000pt solid windowtext; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="169">公元前4世纪</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor windowtext windowtext currentColor; padding: 0pt 5.4pt; width: 159.15pt; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="212">小农经济逐步形成</td></tr><tr style="height: 22.95pt;"><td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor windowtext windowtext; padding: 0pt 5.4pt; width: 126.95pt; mso-border-left-alt: 1.0000pt solid windowtext; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="169">18世纪末</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor windowtext windowtext currentColor; padding: 0pt 5.4pt; width: 159.15pt; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="212">工厂出现</td></tr><tr style="height: 22.2pt;"><td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor windowtext windowtext; padding: 0pt 5.4pt; width: 126.95pt; mso-border-left-alt: 1.0000pt solid windowtext; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="169">19世纪末</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor windowtext windowtext currentColor; padding: 0pt 5.4pt; width: 159.15pt; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="212">集团公司日益增多</td></tr><tr style="height: 23.7pt;"><td style="border-width: medium 1pt 1pt; border-style: none solid solid; border-color: currentColor windowtext windowtext; padding: 0pt 5.4pt; width: 126.95pt; mso-border-left-alt: 1.0000pt solid windowtext; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="169">20世纪中叶</td><td style="border-width: medium 1pt 1pt medium; border-style: none solid solid none; border-color: currentColor windowtext windowtext currentColor; padding: 0pt 5.4pt; width: 159.15pt; mso-border-left-alt: none; mso-border-top-alt: none; mso-border-right-alt: 1.0000pt solid windowtext; mso-border-bottom-alt: 1.0000pt solid windowtext;" valign="top" width="212">自动控制系统问世</td></tr></tbody></table>