And here's some more detail
1An offer
An offer by the party offering something in exchange for something such as a product or service. The verbal agreement must be on proposed terms (e.g. the product/service being offered and the price to be paid). An example of an offer is a verbal quotation over the phone from a product or service supplier.
Circumstances to watch out for
offer was rejected
If an offer was rejected by the party it was directed to, then it ceases to be an offer.
offer was withdrawn
If the party who made the offer then withdraws it, then it ceases to be an offer provided that it was not already accepted by the party the offer was directed to.
expiry of offer
If the offer expires, then it ceases to be an offer. If the verbal agreement does not include a specific discussion on how long the offer is open for, the offer expires at what would be a "reasonable" time for that kind of product or service.
there was a counter-offer
If an offer was not accepted, but the person who the offer was directed to made a counter-offer, then the orginal offer ceases to be an offer.
uncertain or incomplete of terms
If important or "essential" terms in an agreement are uncertain, incomplete, vague or meaningless; and if additional evidence cannot establish what the term was meant to mean, then there cannot be a valid offer.
commercial offers over $40,000
The Australian Consumer Law will imply terms (e.g. guarantees that products are fit for their intended purpose) into verbal agreements unless it is a business related transaction where the value of the product or service is over $40,000.
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2Acceptance
Acceptance by the party who the offer is directed to. An acceptance shows a willingness by that party to accept the offer without further negotiation, and be bound by the proposed terms in the offer.
Verbal agreements are considered informal agreements that can be accepted verbally, as opposed to formal agreements such as some written agreements (e.g. contracts for the purchase of land) that can only be accepted validly by signature.
Circumstances to watch out for
acceptance must be communicated
An offer cannot be considered accepted if it was not communicated to the party that made the offer. A verbal acceptance to the party who made the offer is therefore a valid way to communicate acceptance unless the party offering has previously indicated how acceptance must be communicated (e.g. by post or by email).
proof of acceptance
While a verbal acceptance is a valid acceptance, it is wise to have a witness present or to send an email confirming acceptance, so that there is proof establishing the agreement should an issue occur at a later date. A verbal acceptance followed by both parties performing their obligations under a verbal agreement will also be sufficient to establish proof of acceptance.
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3Consideration
Something of value exchanged for what was offered. It could be something of value given or promised such as money, a service or even a peppercorn.
Circumstances to watch out for
adequacy of consideration
Any consideration can be good consideration, therefore it need not be adequate consideration. This means that an agreement will be valid even if one party to the agreement does a bad deal and offers greater value than what is exchanged in return.
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4Intention to create legal relations
This is to ensure that both parties wanted to be legally bound by the agreement. Being legally bound means that the agreement is enforceable in a court. Compare this with being morally bound which is not enforceable in a court, no matter how much one party feels hard done by by the other party.
Circumstances to watch out for
where no consideration provided
If there was no consideration exchanged then it may stand to reason that the parties did not intend to be legally bound by the agreement.
commercial agreements
In business to business or commercial agreements, it is usually presumed that the parties are intended to be legally bound.