"Expanding the pie" is a strategy used in integrative negotiations where both parties collaborate to increase the total value available before dividing it. This leads to mutual gains and supports long-term, strategic relationships.
Reference: L4M5 Commercial Negotiation 2nd edition (CORE), Section 3.5 - Integrative and Distributive Bargaining Tactics

Finding a middle ground, also known ascompromise or convergence, is a hallmark of collaborative or integrative negotiation. It allows both parties to secure partial wins, supports longer-term relationships, and promotes ongoing goodwill for future dealings.
"Negotiators must balance assertiveness with cooperation. Meeting halfway can lead to agreements that meet minimum needs of both parties while preserving the relationship." (L4M5 Commercial Negotiation, 2nd edition, Section 1.1 - Collaborative Approaches to Negotiation)

'Macroeconomic factors always directly influence the negotiations': This statement is false. For any given negotiation it is not the macroeconomic factor itself that necessarily influences the negotiation but the change or rate of change that factor.
'Changes in macroeconomic factors may affect businesses and individuals differently': This statement is true.
Macroeconomic factors are factors that have general effects on the economy and many businesses may be completely unaffected or affected more or less than others in the same industry by a change in a factor.
'Macroeconomic factors cannot be influenced by anyone's expectation or sentiment': This statement is false.
When it comes to macroeconomic factors another key consideration is expectation regarding what might happen to these factors, or specifically the measures, metrics or percentage rates associated with these factors in the future.
'Expectations on macroeconomic prospect are always correct': This statement is false. Expectations are not always correct.
LO 2, AC 2.2

At the first stage of CIPS Procurement and Supply Cycle (Understand need and develop a high-level specification), procurement professional mainly negotiate with internal stakeholders. They have a duty toproportionately and constructively challenge specification if there's genuine doubt over the need or how the need is expressed. This is called demand management. Their first duty is to the organisation's treasury, not to functional managers.
Demandmanagement including: negotiation/challenge between procurement and internal stakeholders over the need/requirement/specification. Remember that in any process or product, the greatest opportunity for cost reduction is at the design stage.

There are many tactics and ploys that can be used to persuade others, particularly those not trained in negotiation. But in generalthese tactics should be used with care, as they can backfire; and in situations where a long-term relationship is desired, they can be, if detected, become an irritant to TOP.
Tactics are particularly effective if and when you are dealing with untrained negotiators, in consumer's buying situation and in once-off encounter.