A wholesaler sells to a reseller at their usual price. Reseller deliberately sells less than RRP & sometimes less than their buy price. It's a good way to guarantee the reseller "owns" the market. Then, if the reseller is big enough and has captured the market, has the leverage to tell the wholesaler to lower the wholesale price and/or the reseller gets it made elsewhere and becomes the wholesaler.
It's pretty nasty.
It happened to my family business. A big box chain sold the same products for less than their buy price. We were close friends with the wholesaler ( a timber mill), and the sales rep even went to the big box to get them to lift their price.
2 years after shutting us down, the big box store sells the same product, from the same source, for 50% more than we ever used to sell it for.