‘There are some economic terms that are fixed and immutable. Marginal cost will always be the addition to cost from an incremental increase in output, and average cost will never be anything other than total cost divided by output. Other terms have greater fluidity and evolve over time with developments in theory and practice. For this reason, compilation of the Dictionary is never finished and definitions are never final.’
OUP Blog, 1st March 2017
Source: www.blog.oup.com
