Psychological Contract: The unwritten set of expectations and beliefs that an employee has regarding the terms of the employment relationship with their employer.
Efficiency Wage Theory:The idea that employers may pay workers more than the market-clearing wage in order to increase productivity, reduce turnover, and foster a sense of loyalty.
Insider-Outsider Theory: The concept that firms are more likely to retain and protect the jobs of current employees (insiders) rather than hire new workers (outsiders) due to the implicit contracts and investments made in the existing workforce.