Final answer:
The assertion is true; within contract negotiations, amendments such as insertions can be made in a counter offer and must be initialed by the involved party to indicate consent to the altered terms.
Step-by-step explanation:
The statement that a counter offer can include insertions and that all changes would be initialed by the party to indicate agreement with the amended term is true. In contract negotiations, a counter offer may indeed propose amendments to the terms presented in the original offer. This process often includes adding, deleting, or modifying certain clauses. Each change is typically initialed by the party responsible for the modification to demonstrate their consent to the new terms before the contract is finalized. This is a common practice in legal transactions to ensure clarity and agreement on all aspects of the contract.