Explanation
The question asks about the point in time when Jane should make concessions with the supplier. These concessions should be traded afterpreliminary stages such as opening, testing and proposing are over and proposals move from being tentative and general to being more definite and specific. This stage is called bargaining phase. The bargaining phase is the 'meat' of the negotiation meeting.
LO 3, AC 3.1

Anorganisation's expense can be categorised into three groups:
Fixed Costs - costs that do not change with output.
Variable Costs - costs that vary in direct proportion to output.
Semi-variable costs - costs that are a combination of the above, with both a fixed and variable element.
Among the four options:
"Land rental paid in advance": This is fixed cost. The rental won't increase when the production increases.
"Additional pallet hires due to higher demand in year-end season": This can be identified as semi-variable cost (or step cost).
"Governments taxes": The taxes are often levied by a percentage of income or revenue. Therefore, it is variable
"Raw materials for next year production": This is obviously variable cost.

If interest rate are too low and credit is too, cheap rates can fund a spending boom with consumers and businesses buying (investment) more than they can afford to pay back.

Explanation
There are four types of questions that can be used in a commercial negotiation:
Hypothetical questions, where you ask about a possible situation or abstract concept, are very useful at the testing and proposal phases. Hypothetical question does not state any commitment as it is only about 'if something happens, then ...'. This type of question can be useful at giving suggestion.
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LO 3, AC 3.3

A useful model of personal power that has survived the test of time and provide a simple way to analyse negotiation in French and Raven's Power BaseModel, which describes six bases of power:

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