I said in another thread that farm subsidies are a double edged sword, and someone had the kindness to elaborate on this point explaining that it hurts the economy, but it's a necessary evil if we want to keep having cheap food. The main gist of it is that farm subsidies are good to keep people working in the countryside and not having entire swathes of your country entirely unpopulated, control the enviroment, stimulate the economy creating secondary jobs and having stable and low food prices. But the main drawback is that subsidies tend to be distributed uneven, giving more to rich farmers than to poor farmers, how industrial farming is extremely inefficient and takes most of the subsidies and how you need to put in quotas to balance out the market or riks it being flooded with food so cheap the farmers will not make a profit.
In the EU, this works due to 50 years of having this practise. If you have a farm and you want to be a comercial farm (AKA, you want to sell your produce in large amounts) you need to accept the EU quota (therefore, you can only produce certain amounts of X and Y, reason why in the past many farms were forced to close). In a normal situation this is paired with high import tariffs in order to favour local products rather than imports. If there is a good season and there is more food than the one expected by the quota, the EU will finance exports, making these products more desirable. While if there is a shortage, they will lift restrictions on imports.
Meanwhile, another person explained how this system is fucking the canadians right in the ass because of NAFTA, since american farmers sell their produce cheaper than canadians due to essentially being borderless and having subsidies, hurting their primary sector. This as well hurts small farmers because they cannot pay for their production costs while bigger farms are the ones that benefit from this because production costs in farming don't scale linearly.
I'm by no means expert, but i know my way around the EU farming policy and how they keep a stern control over it or production in the EU would become a terrible problem.
Edit: forgot to add, this is also the main reason there is corn syrup in everything. Mainly, because it's cheaper and much easier to produce than sugar, which wouldn't grow in most of the US.