Economist: In the interaction between producers and consumers, the only obligation that all parties have is to act in the best interests of their own side.
Conclusion
Consumers are always obligated to report product defects they discover, while producers are never obligated to reveal them.
Evidence
When it comes to both producers and consumers, the only obligation either has is to act in the best interests of their side.
The distribution of information about product defects is in the best interests of the consumer.
Evaluate
The author's conclusion is about whether people do or don't have an obligation, and the evidence provides the legal standard by which we'll judge someone's obligations: acting in the best interests of their own side
Since the author says consumers are obliged to report defects, he's assuming that it's in their best interest to report defects, and his other premise says that .
So there's a tiny missing link there that "if consumers report product defects, it makes it more likely that information about defects will be distributed.
But since the author says that producers are not obliged to report defects, he must be assuming that it's not in their best interest (too) to report defects.
There is no premise at all about what is / isn't in the producers' best interests. We can tell that's a huge omission from the argument. The author is Assuming a Difference (it's in the best interest of consumers but not of producers).
Goal
Look for an answer saying, . Or look for an answer that, when negated, would weaken the conclusion.