According to Simmel existence in the metropolis requires an economic rationality focused on not .

According to Simmel existence in the metropolis requires an economic rationality focused on  logic not emotions.

Explanation:

Georg Simmel was a German sociologist who was born in Berlin and got his doctorate in 1881.

One of his most renowned writings is The Metropolis and Mental Health which he wrote in 1903. In the book,  he talked about the need for having a 'protective organ" in an urban setting because of the increased external and internal stimuli in a metropolis as opposed to rural areas.

These factors will trigger the need for the use of logic and intellect over emotions because life becomes matter of fact and straightforward with very little needs for emotional concerns.

As Simmel wrote,

"Instead of reacting emotionally, the metropolitan type reacts primarily in a rational manner . . . Thus the reaction of the metropolitan person to those events is moved to the sphere of mental activity that is least sensitive. . ."

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.