Commissioner of Taxes v. Nchanga Consolidated Copper Mines Ltd., [1964] A.C. 948 (PC) -- summary under Goodwill, Trademarks and Customer Lists

The sum of £1,384,569 paid by the taxpayer to another copper mining company in order to compensate the other company for its agreement to abandon production of copper for one year (thereby permitting the taxpayer to expand its production for the year, rather than sharing in an industry-wide cut-back in production) did not result in an enduring benefit or an accretion to its income-earning structure and, accordingly, was fully deductible.