The Corn Laws were measures enforced in the United Kingdom between 1815 and 1846, which imposed restrictions and tariffs on imported grain. They were designed to keep grain prices high to favour domestic producers, and are considered examples of British mercantilism. The Corn Laws enhanced the profits and political power associated with land ownership. The laws raised food prices and the costs of living for the British public, and hampered the growth of other British economic sectors, such as manufacturing, by reducing the disposable income of the British public.
The laws became the focus of opposition from urban groups who had far less political power than rural Britain. The Corn Laws imposed steep import duties, making it too expensive to import grain from abroad, even when food supplies were short. The laws were supported by Conservative landowners and opposed by Whig industrialists and workers. The first two years of the Irish famine of 1845–1852 forced a resolution because of the urgent need for new food supplies. Prime Minister Sir Robert Peel, a Conservative, achieved repeal with the support of the Whigs in Parliament, overcoming the opposition of most of his own party.
Economic historians see the repeal of the Corn Laws as a decisive shift toward free trade in Britain.
In 1689, traders were provided bounties for exporting rye, malt and wheat (all classified as corn at the time), and the same commodities were taxed when imported into England.
In 1813, a House of Commons Committee recommended excluding foreign-grown corn until the price of domestically grown corn increased to 80 shillings (£4—equivalent to £240 in 2015) per quarter hundredweight (1 quarter = 28 lb or 13 kg). The political economist Thomas Malthus believed this to be a fair price, and that it would be dangerous for Britain to rely on imported corn because lower prices would reduce labourers' wages, and manufacturers would lose out due to the decrease of purchasing power of landlords and farmers.