Mindy Chen-Wishart. Contract Law (2018 6 edn). p 24.
I don't understand the red sentence. Kindly can someone
or give an example with numbers?
Kindly can someone
That book is poorly written. Apparently the author's point is that, when a party incurs breach of contract, negotiating --and reaching a settlement-- is more beneficial than seeking a strict or full enforcement of remedies for the breach as provided in the contract.
This makes sense even from the injured party's perspective. That is because breacher is likelier to dispute and obstruct remedies if the full extent thereof is sought by the counterparty. Accordingly, breacher's resistance is likelier to result in litigation, whence also the injured party would inevitably incur expenses.
The author does not really define the odd term "contract-breaker full retention", but from the example on page 313 (well past page 24) it appears that the term means the full extent of remedies available in the event of breach of contract.