A quick search will lead to quotes like "Four companies now control more than half of the market in chicken processing (Tyson, JBS, Perdue, and Sanderson), close to 70 percent in pork (Smithfield, JBS, Tyson, and Hormel), and nearly three quarters in beef (JBS, Tyson, Cargill, and National Beef)"
Supermarket margins are also very low.
There are absolutely a bunch of acquisitions/ consolidation in that food distribution space, but there are still hundreds of different distributors just in the US. However, most volume does flow through the largest distributors.
For example, I had to build a specific feature to merge distributors after an acquisition happens in the industry, to make the product work properly because that's such a common occurrence. Had the same type of feature for manufacturers (my customers) also, because they kept buying each other.
Wow - I didn't realise bidfood.co.nz was a US chain bidfood.com (Bidcorp).
Food markets keep closing down.
The consolidation of restaurant suppliers really affects the quality of taste a restaurant can get. My ex was a cook and the worse restaurants wouldn't even make their own sauces like Hollandaise - she would tell me what brand it was (often a restaurant supplier brand). It is noticeable when the chef has hand-selected their supplies e.g. tomatoes that have flavour.
The root cause is that consumers tend to optimise for cost.
Quality is harder to give a number to.
We're not completely screwed yet - with time/effort (and moderate means) you can find some amazing places at normal prices.
And there are people willing-enough to spend time/effort plus wealthy-enough but that market is much smaller (more exclusive). And unfortunately there are a lot of expensive places that don't optimise for food quality (because people desire other things for their money e.g. obsequiousness, rent-a-vibe cuisine, gastroflex, mealfluencing, yadayada). Aside: Roget's gets spanked by AI when looking for modern words.
It's actually a South African/UK headquartered group, I believe. But operates in many countries around the world.
The people making the decision to buy this slop aren't the ones who have to eat it.