Many years ago, my family owned a furniture store which went out of business. A liquidation company was brought in for the "going out of business" sale and it was quite fascinating to see from the inside. The liquidation company set all of the pricing, did all of the advertising, and even brought in their own inventory to be sold. They continued to replenish the inventory for as long as there was money to be made, and then moved on to the next "going out of business" sale.
It seems like some stores (especially furniture stores from what I've seen) are perpetually "going out of business" if the roadside signs are to be believed. Now that you've said the liquidation company was bringing in their own product in your family's store's case, it makes more sense.