Generally researches like these are meant show how one activity or some way of doing can change the whole scenario, so is this research based on.
In corporate or office life if one get the appreciation or the appraisal and incentive for their work, they ultimately get motivated & provide best outputs. So, Indeed when an employee feel content & satisfied with its companies services & facilities, he/she will always do more productive work which will ultimately increase the company's profit.
So, this all is a give and take process. If you take care of your employee happiness, you are indirectly investing for your business growth. Industries should try to provide a healthy & easy environment instead of a cut-throat environment because it is harmful for their employee's productivity over time whereas a positive environment will lead to dramatic benefits for both the employers & employees.