A good book on the subject of the customs union has for long been wanted; and now it is provided by Professor Viner's study, which it is difficult to praise too highly.... Professor Viner's study on the economic aspects of customs unions will be of central interest to economists. Indeed for many years this is likely to remain the locus classicus for the economic analysis of customs-union problems.

James Meade, "The Removal of Trade Barriers: The Regional versus the Universal Approach." Economica (1951). p. 186-7. Cited in: Jacob Viner, Paul Oslington (2014) The Customs Union Issue. p. xxxi