The goal wasn't to stabilize prices, but to provide strategic defense against food shortage in emergencies.
If that's your entire goal, it's a bad one. You won't be able to get enough food for your defense during a shortage if the farmers get bankrupt during high-production years.
If that's your entire goal, it's a bad one. You won't be able to get enough food for your defense during a shortage if the farmers get bankrupt during high-production years.