My mind jumps to something Budweiser did, after being purchased by InBev. Their recipe uses a particular hops from a unique valley in Germany. Under InBev, they

My mind jumps to something Budweiser did, after being purchased by InBev. Their recipe uses a particular hops from a unique valley in Germany. Under InBev, they suddenly declared they had enough of these hops, and wouldn't buy any more for a year. This crushed farmers in that valley, of course... and then Budweiser could negotiate for better prices with the survivors a year later.