This book features the main papers of Günter Schmölders (1903-1991), a pioneer in economic psychology for the first time in the English language. Schmölders incorporated psychological considerations in his economic analyses at a time when the distance between the two disciplines was much larger than today. His research on 'fiscal psychology' is of particular and lasting interest, impacting greatly on continental economics. During his lifetime, Schmölders failed to build bridges to enable his contemporary fellow economists to appreciate the importance of his work, however the relevance of his approach is much more obvious in the world's current economic climate.