Ilse Mintz, Trade Balances during Business Cycles (1959)

Mintz’s study is a disciplined empirical challenge to theories of international adjustment that assumed, rather than measured, how trade balances behave over the business cycle. She begins from a gap in the literature:

little is known about the actual relations of trade balance changes to business cycles.

The object is not to construct a general model in advance, but to determine the cyclical facts for the United States and Britain since 1880. Mintz narrows the inquiry deliberately:

By trade balances we mean the values of exported minus the values of imported merchandise.

This limitation to visible trade is justified because service balances usually did not offset merchandise-balance movements. The work’s structure follows from its method: first the U.S. balance, then the British balance, then the construction of “world cycles,” and finally a synthesis of findings and implications. Its central conceptual move is to combine domestic business-cycle phases with foreign or “world” trade phases, distinguishing co-phases from counter-phases. World cycles are treated pragmatically, not metaphysically:

Their justification must lie in the insights they afford us.

For the United States, Mintz finds strong inverse conformity between the trade balance and domestic business cycles. The balance does not merely fluctuate randomly around trend:

The balance swings in cycles of 5 to 21 quarters' duration, and these cycles are closely related to United States business cycles.

The American export surplus typically fell in expansion and rose in contraction. This was not simply because imports rose with domestic prosperity; exports also weakened in late expansion as domestic demand, prices, delivery lags, and reduced incentives to sell abroad checked foreign sales. Mintz’s concise formulation is:

General expansion depressed, contraction improved the trade balance.

The crucial refinement is that the U.S. balance behaved most systematically near business peaks and in counter-phases. When American expansion coincided with world contraction, the balance fell with exceptional regularity; when American contraction coincided with world expansion, it rose. Thus foreign trade became most intelligible when domestic and world movements were separated rather than collapsed into a single “prosperity” or “depression” category.

Britain provides the comparative surprise. Before World War I, the British trade balance—always a deficit—was comparatively stable and conformed positively to British business cycles. Around peaks it moved in the opposite direction from the American balance:

The British balance behaved in the opposite fashion.

British export values tended to rise strongly late in expansions, while imports often continued to rise at the opening of contractions. The result was a prewar pattern in which the balance improved before peaks and deteriorated just after them. After World War I, however, the British pattern reversed: the balance became inversely related to British cycles, like the American balance. Mintz attributes the change chiefly to altered price and terms-of-trade behavior rather than to a simple change in the relation between British and world cycles.

The world-cycle section is essential because Mintz rejects national-cycle analysis as insufficient for foreign trade. She constructs world import cycles, excluding the country under study, and uses them to classify domestic phases. This yields one of the study’s most important historical claims: Britain before 1914 almost never expanded against a contracting world economy.

world expansion was a necessary though not a sufficient condition for British expansion.

The broader conclusion is anti-schematic. Trade balances are cyclical, but they do not follow one universal rule applicable to all industrial or creditor countries:

there is no common cyclical pattern for trade balances of all industrial countries or of all creditor countries.

Mintz’s relevance lies in showing how international transmission depends on timing, phase-combination, and the composition of trade movements. U.S. balance movements tended to be countercyclical for the domestic economy, especially before World War I, tightening near peaks and easing after downturns. British prewar balance movements, by contrast, could reinforce domestic cycles, while postwar British movements became countercyclical and directly relevant to policy under external constraint. The paper’s lasting contribution is methodological as much as historical: it replaces broad assumptions about “foreign trade in prosperity” with a phase-sensitive empirical framework capable of explaining why similar countries, and even the same country in different periods, displayed sharply different trade-balance cycles.