This is quite a claim, but it's too vague for me to research independently. Where would I even start in exploring the "enormous body of law" that "incentivizes a top-down corporate business structure?" I am not asking rhetorically -- this is news to me and I'd like to know the details.
Of course, co-ops aren't common in the US, but they do exist (like REI) so I'm just curious about the details of this criticism of the legal landscape in the US but without further information am unable to research the claim.
Arguably that's exactly the problem. There's so much law applying to farming that you'd need a sizable legal department to know it all. That favors centralization.
That applies to every field as corner cases are covered. Restricting it to what is actually relevant to the domain is sufficent to "consultation with relevant country lawyer" as opposed to entire law firms.
I can't speak for France specifically but if it's anything like the UK and Ireland then farming families are dis-incentivized to sell land because its costs nothing to hold, and always increases in value. As a farmer you might not even own the land you work on but rent it for the season, and large corporations don't work well with that kind of uncertainty.
I would be very careful in trying to attribute something as complex as corporate structures to human nature. We have seen massive changes in all parts of society throughout the last 10k years. I don't think the human genome has changed so rapidly as to cycle through slavery, feudalism, mercantilism, capitalism, etc.
It's always such a convenient and supremely lazy explanation. It's human nature for blacks to be servile. It's human nature for peasants to be ruled by the lord of the manor. And so on.
There are many corporate things that "stop people from doing that".
Seed monopolies [0]. Costco is undercutting chicken production just to maintain a $4.99 offering to their customers [1]. Mega farms have put over 2700 family farms out of business in Wisconsin [2]. CAFOs create pollution equivalent to 168 million people in the state of Iowa with only a total population of 3.2 million people [3]. All of this manure gets dumped back into the soil for monoculture corn farming which is grown to feed livestock which is also significantly inefficient and drains local resources on clean and fresh water supplies and significantly pollutes downstream via runoff into large rivers [4]. The main polluters are, again, these large scale farms concentrating operations for efficiencies to fulfill the ever expanding lineup of highly processed foods the majority of western culture now eats on a daily basis.
Money stops local farming. These mega farms are not in the business to make a great product, they're in the business to make a great profit - at the expense of their customers, no different than the tobacco manufacturers agenda. Between lobbyism, patents, mergers and grants by states desperate for revenue the concentration of control in farming has become very bleak in a short decade.