According to the Borchardt hypothesis, state ar bitration during Weimar's relatively stable years (1925-29) led to excessive wage pressure. As a direct consequence, profits were squeezed hard and investment fell, giving rise to a 'small-cake economy' which, in the end, had to fail. Borchardt's interpretation, hotly debated amongst German and Anglo-Saxon scholars for some time, is challenged in this paper. I first discuss the shifts in basic demographic variables during the early decades of the twentieth century. It will emerge that declining population growth rates are largely responsible for the changes in macro-economic va riables noted by Borchardt. Finally, this article demonstra tes why the indicator of wage pressure used in previous work is fundamentally flawed. Ever since Knut Borchardt challenged the conventional wisdom about the Wei mar Republic's economy in general and the scope for action during the Great Depression in particular1 economic historians have continued to debate his conclusions.2 The so-called Borchardt hypothesis has two elements that are * Address all communications to Hans-Joachim Voth, European University Institute, Badia Fiesolana, Via dei Roccettini 9,1-50016 San Domenico Di Fiesole, Italy. The author wishes to thank seminar audiences at St. Antony's College, Oxford and EUI, Florence, for valuable comments. Albert Carreras, Peter Hertner and Tony Ni cholls were kind enough to comment on earlier versions. The DAAD has once more provided generous financial assistance. All remaining errors and inconsistencies are my own. 1 K. Borchardt, 'Zwangslagen und Handlungsspielr?ume in der gro?en Wirtschafts krise der fr?hen drei?iger Jahre', in: Jahrbuch der Bayerischen Akademie der Wis senschaften 1979, pp. 85-132; reprinted in: Ibid., Wachstem, Krisen, Handlungs spielr?ume der Wirtschaftspolitik, G?ttingen 1982, pp. 165-82. 2 The most important contributions are: C.-L. Holtfrerich, 'Zu hohe L?hne in der Weimarer Republik? Bemerkungen zur Borchardt-These', Geschichte und Gesell schaft 10 (1984), pp. 122-41; H. James, 'Economic Reasons for the Collapse of the Weimar Republic', in: I. Kershaw (ed.), Weimar: Why Did German Democracy Fail?,