求翻译：720年倒闭的南海公司给整个伦敦金融业都带来了巨大的阴影。17世纪，英国经济兴盛。然而人们的资金闲置、储蓄膨胀，当时股票的发行量极少，拥有股票还是一种特权。为此南海公司觅得赚取暴利的商机，即与政府交易以换取经营特权，因为公众对股价看好，促进当时债券向股票的转换,进而反作用于股价的上升。是什么意思？

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