Not sure which surplus country you are living but globally every country is feeling the pandemic and there is a shortage of products and if you are having shortage the price rises naturally and how come you are not aware of these natural process.
European country. Our country produces only a small part of products we have on the shelves, most are imported. Our major retail operators, thus majority of food are imported. We do have local warehouses, but still they are smaller, much smaller than in retailers home country.
I've seen products shortage only in March, when people went crazy buying toiler paper, rice, canned food.
Lets take most popular food. Milk, bread, eggs, rice. Milk prices are from 0.90 euro, bread ~1 euro, eggs 1 euro per 10, rice 0,85 euro for 4x125g pack. Last year prices were if not the same, but less than 5 cents lower. I dont see any "doubled" in food shops.
I think every country went crazy with the necessities because everybody went into a state of panic which we really can't blame to the people. Its also new to me that some European countries are importing items from other country which is really weird since some of the country in Europe had the best response to this pandemic although its really inevitable. Prices of Pork is the only thing that doubled in our country even though there are no shortage.