Taylor v Johnson (1983) 151 CLR 422
In this case, Mrs Johnson gave to Mr Taylor an option to purchase a parcel of land for a specified price. Mrs Johnson believed that the sale price was to be $15,000 per acre. In fact, she was mistaken and the option specified the sale price to be $15,000 total. When this came to light, Mrs Johnson refused to go through with the sale, and Mr Taylor sued to force her to perform the contract.
Based on this case the HC made a number of important statements about how these unilateral mistakes should be treated by the court
- The test in an objective test (not subjective).
The fact that one party feels they made a mistake about the contract is not enough to prove the mistake. The court will apply a reasonable pe3rson test to determine if a mistake has been made
- Equity would rescind (set aside) the contract in this situation because the D had taken deliberate steps to prevent the P from becoming aware of her mistake.
As a result equity will intervene as to the subject matter of the contract when the following three conditions hold true
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- The other parties conduct must amount to more than simply failing to correct the other party's mistake: it must amount to an unconscionable effort to prevent the other party from becoming aware of the mistake
also see of XCB Pty Ltd v Creative Brands Pty Ltd [2005] VSC 424