As a business owner, you have probably come across the term 'Economies Of Scale'. If not, that is business jargon for "higher quantity ordered = lower price per unit". The bulk discount feature allows you to specify what discount a customer will receive if they order in large quantities.
Start by installing the Bulk Discounts feature under the Features tab:
After installing the feature, head over to a product which you wish to add a bulk discount to, press the edit button and you will find the bulk discount feature and the left hand side under More Options.
Then simply enter the quantity a customer must buy, and the discounted unit price they will receive if they order the specified quantity. Therefore if a customer buys 1 they would pay £999.99, but if they buy 2 - 20, the unit price would be £979.99 giving a £20 discount.
[remember]Please note, bulk discounts will not work with variants.[/remember]