What is the core of the psychological contract?

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Thanks for the invite, this is not my area, I agree with the experts answers

The core of the psychological contract can be measured in terms of fairness of treatment, trust, and the extent to which the explicit deal or contract is perceived to be delivered.

the psychological contract - theory explanation, models and diagrams,Where an organization's basic constitution and rules work against people's core needs.

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I am apologies to answer this question because it's not my specialist field