If the marginal revenue is negative then the revenue lost from receiving a lower price on all the units that could have been sold at the original price is smaller than the additional revenue from selling one more unit of the good.

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If marginal revenue is negative, it means that the additional revenue earned from selling one more unit of the good is smaller than the revenue lost from lowering the price on all units sold. This is because the demand for the good is decreasing, so as more units are produced and sold, the price must be lowered to entice buyers. Therefore, the revenue lost from selling units at a lower price outweighs the additional revenue earned from selling one more unit.

If the Marginal Revenue Is Negative Then the Revenue Lost