Distinguish the following: Quantum Meruit and Anticipatory Breach

Quantum Meruit: The expression "Quantum Meruit" literally means "as much as earned" or reasonable remuneration. It is used where a person claims reasonable remuneration for the services rendered by him when there was no express promise to pay the definite remuneration. Thus, the law implies reasonable compensation for the services rendered by a party if there are circumstances showing that these are to be paid for. Anticipatory Breach: Anticipatory Breach of contract may occur before the time for performance is due. This may happen where one of the parties definitely renounces the contract and shows his intention not to perform it or does some act which makes performance impossible. The other party, on such a breach being committed, has a right of action for damages. He may either sue for breach of contract immediately after repudiation or wait till the actual date when performance is due and then sue for breach. If the promisee adopts the latter course, i.e., waits till the date when performance is due, he keeps the contract alive for the benefit of the promisor as well as for his own. He remains liable under it and enables the promisor not only to complete the contract in spite of previous repudiation, but also to avail himself of any excuse for non-performance which may have come into existence before the time fixed for performance.