Economist: Every business strives to increase its productivity, for this increases profits for the owners and the likelihood that the business will survive.
Conclusion
But not all efforts to increase productivity are beneficial to the business as a whole. rephrase: Some efforts to increase productivity are not beneficial to the business as a whole.
Evidence
Often, attempts to increase productivity decrease the number of employees, which clearly harms the dismissed employees as well as the sense of security of the retained employees.
Evaluate
We know that on Main Conclusion, the #1 pattern for where to find the conclusion is after a Pivot word like "but / yet / however".
Typically, this is taking the form of a Rebuttal. In this case, the author isn't exactly rebutting someone's claim, but the first sentence does talk about what other people are doing. They are striving for productivity, and she is pushing back with a reminder that trying to increase productivity can sometimes be bad.
Like 90% of Main Conclusion arguments, this is an upside-down argument. The Conclusion appears first and then the Support follows.
Goal
We just want the best meaning match for the 2nd sentence.