Not all who engage in trading become wise.
Here we learn that not all who engage in trade become wise. This means that some do not but some do. If such is the case, isn't it important to tell us who does and who does not? Or, to put it differently, we all know that every rule has exceptions, so what does telling us that not all traders become wise actually tell us?
You could suggest that there may have been a time when everything that traders did was right and good. In the end of the 20th and the beginning of 21st century, especially in Russia, people believed that poets were inspired and that everything that a poet or a writer said, was beautiful and true. Perhaps, there was a time when everything business people did was right and wise. I can see how a traveling buisness person, who had seen places and cultures beyong imagination of the simple farm folk, could be considered the repository of all wisdom. For such a time, teaching us that sometimes traders are not wise is enough to break the spell.
This is not the only place in which Chazal comment on merchants and wisdom. Rashi here brings the verse in Devarim 30:13 that says that Torah "is not beyond the sea". Sifri comments on it: "(Torah) is not with those who go beyond the sea to trade".
Sefas Emes gives us a clue. He says that this refers to a method of Torah study, known as
"trading". In Mishlei 32, the woman of valor is referred to as "merchant ship that brings food from a far". This refers to a Torah scholar who explains one place based on another place. Another way that this is expressed is to say that words of Torah are poor ( a play on the word Aniya, which meeans both "poor" and "ship") in one place and rich in another place.(Tos. Krisus 14a from Yerushalmi Rosh Hashana 3:5)). He explains that there exists a method of study that brings faraway analogies from seemingly unrelated sources to make a novel case. This method of study is not always the wisest.
If we translate the language of Sefas Emes into contemporary epistemology, we come to a distinction between being clever and wise. Some people are clever and others are wise. Some are even clever and wise at the same time.
Jews are a clever people. They always look to find a way to go from Boston to New York by the way of Chicago. Jewish propensity to be clever, says the historian Paul Johnson, makes us a subversive force and an agent of change in most societies. Gentiles tend to think linearly while Jews are non-linear thinkers. Sometimes this is good; sometimes it is bad.
Our yeshivos teach cleverness. Sometimes, cleverness comes at the expense of common sense. Cleverness can lead one to counter-intuitive conclusions, good in theoretical physics, not so good in most life situation. Cleverness does not know how to evaluate bright thoughts, to weigh and evaluate them, to decide whether to accept or reject them. It grasps onto the novel and elegant and abandons and despises the simple and sensible. Many Torah scholars are clever but few are truly wise.
Merchants succeed because they are clever. Wisdom is not a necessary ingredient for buisness success. It is enough to be clever, to figure out a marketing gimmick, a competitive advantage, another distribution scheme, how to shuffle around income and liablities. Mercantile experience can teach cleverness but not necessarily wisdom. Merchants, of course, can be wise---sometimes, not by virtue of their specific business experience but because of their general life experience.
This is what the mishna teaches us. Not all traders are wise. Understand the distinction between clever and wise.

