This is an interesting example of what happens when the supply and demand curve goes into the extreme ends of the chart: The price of "selling" your product goes negative. It costs money to get rid of it. Negative prices occur from time to time in the electricity market because some types of power plants are slow to ramp up and down. So if demand falls too rapidly, spot electricity prices can negative.
> The price of "selling" your product goes negative. It costs money to get rid of it.
But there also has to be a cost (or other liability) to keeping it, or you could just wait for demand to arise. (There generally is some kind of inventory/warehousing cost. But just saying.)