The plantation economies of the New World were built on slave labour. The huge profits to be made by European merchants drove the continuation of the slave trade until its abolition in 1807.
Buying slaves was expensive, but the profits from their labour outweighed the costs. Approximately 70 per cent of slaves were brought to the New World to produce sugar, the most labour-intensive crop. The rest were employed in harvesting coffee, cotton and tobacco.
Sugar growing was labour-intensive, requiring many slaves to make it profitable. The rich planters could also afford to work enslaved people to death and then buy more.
In 1800 the most profitable West Indian colonies belonged to Britain. The British planters there made small fortunes.
After 1791, the British Caribbean islands produced the most sugar and the British people quickly became the largest consumers.
Between 1630 and 1807, Britain's slave merchants made a profit of about £12 million. Slaves produced about 75 per cent of exports of raw goods from the new colonies.
Preparing a slave ship for the triangular trade was an expensive and time-consuming business. Ships could take over a year to return to Britain and make a profit. In order to afford such voyages, merchants needed money to cover their initial costs.
The Bank of England made money available for slave voyages.
There was a high risk of human and non-human cargo being lost 'en route'. Britain's oldest insurance company, Lloyds of London, underwrote (insured) slave ships.
There is some evidence that the slave trade was becoming less profitable towards the end of the 18th century.
The price of buying slaves in Africa was rising, reaching £25 in 1800, but the price for selling in the Americas had not risen as quickly, and was only £35 in the same year.