quality:corruption, information:extraction
Changing trade policy

In addition to the start of the opium trade, economic and social innovations led to a change in the parameters of the wider Sino-European trade. The formulation of classical economics by Adam Smith and other economic theorists caused academic belief in mercantilism to decline in Britain. Under the prior system, the Qianlong Emperor restricted trade with foreigners on Chinese soil only for licensed Chinese merchants, while the British government on their part issued a monopoly charter for trade only to the British East India Company. This arrangement was not challenged until the 19th century when the idea of free trade was popularised in the West. Fueled by the Industrial Revolution, Britain began to use its growing naval power to spread a broadly liberal economic model, encompassing open markets and relatively barrier free international trade, a policy in line with the credo of Smithian economics. This stance on trade was intended to open foreign markets to the resources of Britain's colonies, as well as provide the British public with greater access to consumer goods such as tea. In Great Britain, the adoption of the gold standard in 1821 resulted in the empire minting standardised silver shillings, further reducing the availability of silver for trade in Asia and spurring the British government to press for more trading rights in China.

In contrast to this new economic model, the Qing dynasty continued to employ a Confucian -Modernist, highly organised economic philosophy that called for strict government intervention in industry for the sake of preserving societal stability. While the Qing government was not explicitly anti-trade, a lack of need for imports and increasingly heavy taxes on luxury goods limited pressure on the government to open further ports to international trade. China's rigid merchant hierarchy also blocked efforts to open ports to foreign ships and businesses. Chinese merchants operating in inland China wanted to avoid market fluctuations caused by importing foreign goods that would compete with domestic production, while the Cohong families of Guangzhou profited greatly by keeping their city the only entry point for foreign products.

At the turn of the 19th century, countries such as Great Britain, the Netherlands, Denmark, Russia, and the United States began to seek additional trading rights in China. Foremost among the concerns of the western nations was the end of the Canton System and the opening of China's vast consumer markets to trade. Britain in particular was keenly increasing its exports to China, as the empire's implementation of the gold standard forced it to purchase silver and gold from continental Europe and Mexico to further fuel its rapidly industrialising economy. Attempts by a British embassy (led by Macartney in 1793), a Dutch mission (under Jacob Pieter van Braam in 1794), Russia (headed by Yury Golovkin in 1805), and the British again (Earl William Amherst in 1816) to negotiate increased access to the Chinese market were all vetoed by successive Qing Emperors. Upon his meeting the Jiaqing Emperor in 1816, Amherst refused to perform the traditional kowtow, an act that the Qing saw as a severe breach of etiquette. Amherst and his party were expelled from China, a diplomatic rebuke that angered the British government.

One major reason was that British consumers had developed a strong liking for Chinese tea, as well as other goods like porcelain and silk. But Chinese consumers had no similar preference for any goods produced in Britain. Because of this trade imbalance, Britain increasingly had to use silver to pay for its expanding purchases of Chinese goods. Britain suffered from a huge trade deficit during the Sino-British trade. Meanwhile, the high tariff made the British government very dissatisfied with the Qing government. The Chinese only allowed silver in exchange for the products they were offering so a significant amount of this commodity was leaving the British Empire.

As its merchants gained increasing influence in China, Great Britain bolstered its military strength in Southern China. Britain began sending warships to combat piracy on the Pearl River, and in 1808 established a permanent garrison of British troops in Macau to defend against French attacks.