Wartime conditions often trigger price increases. Sometimes this led to concern about profiteering, which governments came under pressure to regulate. During the First World War the combined ('fusion') government of the Reform and the Liberal parties established a Board of Trade to monitor profits and prices. To judge from this cartoon in the Maoriland Worker in 1915, there was some scepticism about the board's efficacy.
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Alexander Turnbull Library
Reference: The Maoriland Worker, 3 November 1915, p. 1 (N-P 279-1)
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.