In order to win an order, a salesman often makes a lot of promises, but he doesn't know whether he can sell it or not. The end result is that they can't supply as required and become treacherous.
Of course, some sellers have a good idea and change the corresponding product specifications after winning the order, but the changed specifications are often invisible to the buyers, which is that it is better to buy than to sell.
Under the pressure of continuously reducing costs, procurement has gradually become a treacherous party, and the most direct manifestation is the default of payment. Some buyers will try their best to find some faults and pay less.
For some small things, there are countless newcomers who buy and use sales.
For sellers, even if they cheat each other, it is easy not to let them know, because it is not easy for customers to come. For buyers, it is more direct. No money is no money. The big deal is to find someone else to buy it next time. There are too many suppliers.
The contract is just a piece of paper. Buyers can control most sales behaviors by holding orders and adding some skills, while sellers' products need some features and should not be easily replaced. Only such cooperation can guarantee mutual trust.
In today's society, honesty is not because of morality or business ethics, but because it can restrict each other. Once one party loses its restraint on the other, it will definitely be betrayed.