Having trust in the market is not a magic solution. Yes, prices will rise as they already are if there is a shortage but that's not going to make local production materialises out of thin air if there are other obstacles.
At some point, you need a concerted strategic answer at the correct level if you are facing a strategic threat like disruption of food supply. That's why China restricted exports. It remains to be seen if the USA and Europe will react fast enough and appropriately enough. What happened with Covid doesn't give me much hope.
Edit: As I am downvoted strongly (I imagine that it’s because the Covid answer is stupidly seen as political in the US - at least I hope so because if it’s about the ability of the market to solve issues it doesn’t bode well for us all), the EU took ages to secure first masks then vaccine supply and the utter stupidity of the US answer which avoided imposing wearing masks and making vaccination mandatory costed you hundred thousands of unnecessary death compared to country of equivalent development. Look at Taiwan or South Korea to see how it supposed to be done.
At some point, you need a concerted strategic answer at the correct level if you are facing a strategic threat like disruption of food supply. That's why China restricted exports. It remains to be seen if the USA and Europe will react fast enough and appropriately enough. What happened with Covid doesn't give me much hope.
Edit: As I am downvoted strongly (I imagine that it’s because the Covid answer is stupidly seen as political in the US - at least I hope so because if it’s about the ability of the market to solve issues it doesn’t bode well for us all), the EU took ages to secure first masks then vaccine supply and the utter stupidity of the US answer which avoided imposing wearing masks and making vaccination mandatory costed you hundred thousands of unnecessary death compared to country of equivalent development. Look at Taiwan or South Korea to see how it supposed to be done.