Relative to an open market setting (such as farmer's market), the division of labor that underpins the supermarket cultivates ties with those who produce the food we buy.

The division of labor that underpins the supermarket cultivates "impersonal ties".

The division of labor refers to the partition of assignments in any framework with the goal that members may practice. People, associations, and countries are invested with or obtain particular abilities and either combinations or trade to exploit the capacities of others in addition to their own.
And if we compare the division of labor in open market place and supermarket place, you will see that in open market place the relations are personal and in supermarket, the relations are said to be impersonal and largely invisible.

Relative to an open market setting (such as farmer's market), the division of labor that underpins the supermarket cultivates impersonal ties with those who produce the food we buy. In concept of open market setting, the relations are somewhat personal with whom we buy the produce but in case of Supermarket, the relations are impersonal.