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Jevons' analysis, 2.— Other theories of cyclical relations: Moore, 4; Huntington, 5.— The solar cycle, 7.— Correlation between solar and economic cycles, 9.—Changes in solar cycles and economic series, 10. — Variation in latitude of sunspots and index of physical production, 11.— Correlation between solar cycles and non-agricultural series, 13. — The explanation of this relation, 23.— Theories: Pigou, 26.— Hexter, 28.— Vallot, 29.— Effect of ultraviolet rays, 31. — The electrical hypothesis, 33.— The volcanic dust theory, 35.— Correlation between temperature and business activity, 38.— Correlation between monthly figures of the “preferred solar constant,” business activity, and solar radiation, 42.— The last depression and the psychological theory, 45. — Monthly variations in speculation and solar activity for 1929, 46. — Sunspots in the central zone and speculation, 49. — Conclusion, 51.
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Garcia-Mata et al. (1934) studied this question.
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