Not quite, it’s a little more complicated than that.

Supermarkets stopped buying veg when the price went up because they knew they could blame it on other factors, rather than people thinking the supermarkets were tight cunts. Customers are generally accepting of prices going up (they have no other option), it’s the supermarkets who want to charge as high a price to customers while paying as little as possible themselves. The supermarkets then use this whole thing as a negotiating tactic to try to bring down their cost prices.