If only in terms of the actual work you do, fitting in at your workplace makes a big difference. A cohesive team, bound together not just by their presence in an office or factory but by shared interests and social experiences, makes for a much more effective unit than one where work is the only thing bringing them together. At the very least, the employer will need to recruit new staff a lot less often.
For an employee, a workplace where you fit in with your colleagues feels like a completely different place to one where you don't. Being a part of a group gives you more energy and enthusiasm and inspires creativity, as well as providing access to a ready-made social network with immense potential. If you don't fit in at your workplace, you're unlikely to be very happy or to stay there very long.
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