The primary theme of the book is how people settle disputes or decide how to share work or costs by informal means rather than using a government legal system or other organized institutions. I would think, in terms of humans, this could be done by using anthropological studies of hunter-gatherer or other pre-government societies. Perhaps, the author wanted to study the question in a context in which there was a government structure available as a potential choice. To the extent the purpose was to consider the applicability to modern society, I had question about the choice of areas to focus investigations.
The most emphasized example was a community dominated by cattle ranchers in very rural area in far northern California. (The discussion surrounding these ranchers and the relevant laws takes up the first 1/3 of the book.) The author didn't simply stumble across the community and decide it had something to say. He searched for the "right" ranching area and chose this one. In that it is rural, has many people who try to ranch as was done in the "good old days," that these people are small businesses with some employees, that ranches must be very large so they are even more spread out than family farms, that these are more homogeneous communities, that in such small communities it's possible to know everybody's reputation, and such reasons these might not be fully translatable to much of developed nations. The other examples he repeatedly and/or at length describes are atypical of modern society - the whalers of the 1700s / 1800s, lobster trappers, etc. There are passing references to other examples which are more related to modern society, but are not central pillars of the work.
(The authors discussion of game theory's Prisoner's Dilemma seemed especially distant from these communities in which people know each other and their reputations, and can communicate and meet with each other. and are real people with social emotions and norms.)
Only in the closing chapter is there real consideration of informal arrangements in contexts such as residential neighbors, or between business and consumer, or landlord and tenant. Since the ranchers do employ ranch hands, the ranching study could have taken a look at this. This could have been significant as the book discusses the question of why or under what circumstances ranchers, whalers, etc. tend to choose informal as opposed to legal routes to resolve issues.
The book suggests a few reasons for which social norms develop / survive and are preferred to legal approaches. One is "transaction costs" - the expense of each method's procedures, and the difficulty in establishing / getting agreement on how a rule applies to a particular case. Sometimes, a question of the fairness of third parties who will make a decision using a certain route is a factor. It sounds as if there can also be more of a sense that this is "our" norm, more than a feeling this is "our" law. I had the impression the ranchers seem as if they may feel a sort of social pressure or community membership in not questioning "the way it's always been done." The author also talks about "welfare maximizing." That may make sense in that it can be more efficient for one of the ranchers to fix a border fence rather than coordinating both ranchers on the same job. However, in something like an employer-employee agreement the question may be more like having a pie and deciding how to divide it.
One way or the other, the ranchers studied were stuck in their view based on their social norm. They believed a part of their norm was also the law - and when they found court judges and insurance adjusters telling them the law was not the same as their norm, they concluded the judges and adjusters were incompetent and kept believing their norm was also the law.
On the rare occasion the book refers to conscience as a factor, it treats conscience as a strictly learned motive. The book was written when the universality of conscience in all cultures was not yet widely treated as indicating an innate conscience with more specific rules being developed by each culture.
Near the end of the book, the author suggests ways to check his hypothesis about choices of informal rather than legal approaches - in situations more typical of modern society. And he tends to give passing references to information which is consistent with his hypothesis in those modern situations. For instance, he discusses landlord-tenant issue handling. He tells us that a study indicated that in Green Bay, WI, landlord-tenant issues tend to be dealt with informally and people seem generally satisfied. But in NYC, he tells us these issues tend to be handled legally, and he thinks NYC is atypical. I can see there may be truth in this. In smaller communities there are at least two factors which may contribute to greater cooperation. First, there's greater familiarity with others' reputations and, therefore, concern about one's own reputation. Second, those who don't want to be bound by the effects of reputation, people who are more greedy / ambitious, and people who want to take advantage of larger numbers of others will gravitate to cities and other larger communities. Small communities end up with a smaller percentage of people who would weaken informal channels, and larger communities end up with higher percentages. But the author doesn't develop the question for larger communities. Rather, he argues that rent control laws just make landlords do less maintenance, so those laws don't really help. His perspective is that a reasonable landlord-tenant deal is a rent consistent with market-rate values - so less rent "requires" making the housing of lower market value. He also refers to rent control harming symmetry. My impression is that he views landlord and tenants in a free market as on a level playing field, and rent control disrupts that.
So, I have various questions about his thesis. Do we want to be strictly market-based, and does market-based actually provide a just neighborly arrangement in general? Are there problems with agreements between more powerful and less powerful individuals? How do we maintain enough of the benefits of informal arrangements while having a legal system for cases in which one side is not motivated by or corrected by informal mechanisms?
My personal experience includes having felt a need to take a company to Small Claims Court a few times. What I observed about Small Claims Court in general is this: Average people waiting for hours for their case's turn to come. In the large majority of cases, a representative from the company's law firm would stand up and give an unimpressive reason for postponing the case. The trick was that the companies were permitted to postpone on two occasions without any special reason. So, it appeared companies virtually always postponed twice. Meanwhile, if the average person ever failed to be in the room at the moment the case was called, the case was permanently closed. So postponing meant three chances the claimant would have the case dropped. It's hard for me to imagine that the same companies that would play the game this way would be inclined to make fair deals via informal agreements. Generally, I ask, if informal arrangements can serve the purpose, what lead unions, consumer groups, environmental groups, etc. to go to the expense and effort to establish laws? Surely, there were labor disputes in small communities in the good old days which weren't settled informally to mutual satisfaction.
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So, what is the relative benefits of informal and legal paths in modern society? Business interests can exert much influence on legislation, so the legal system may not be a level playing field. City people and such often assume there is limited sense of social norms of fairness or opportunities to get a better deal through informal interactions with businesses. But I've known some instances when people talked businesses into taking better action than I would have expected was possible. It would be interesting to see a thorough study indicating what consumers / employees / tenants can actually get from businesses through informal approaches as opposed to what they can get through formal approaches (legal action, union contracts, etc.)
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This is an issue for large societies: How do we have the egalitarianism which is maintained in small societies in which everyone knows each other's reputation? How do we minimize the tendency to view the people we know (or have been told of by people who know them personally) as the well-behaved "us" and the people who we don't have the personal knowledge of as less well-behaved "them"? How do we balance the fact that individuals practicing reciprocity can maintain community spirit and a more directly perceived interdependence, and a social safety net that provides more security for the needy but makes the reciprocity indirect and "hidden"?