The pro-slavery lobby argued that the trade was nationally beneficial and the economy may collapse without it. This clip need using with CAUTION as it reflects the language of the time, which is unacceptable for use today:

The most approved Judges of the Commercial Interests of these Kingdoms have been of the opinion that our West-Indian and African Trades are the most nationally beneficial of any we carry on... That Traffic alone affords our Planters a constant supply of Negro Servants for the Culture of their Lands in the produce of Sugars, Tobacco, Rice, Rum, Cotton, Fustick, Pimento and all our other Plantation Produce: so that the extensive Employment of our other Shipping in, to and from America, the great Brood of Seamen consequent thereupon, and the daily bread of the most considerable of our British Manufactures, are owing primarily to the Labour of Negroes.

Pamphlet published in London in 1749