In most advanced economies, working hours have steadily declined, while the per-capita income has steadily increased. Boppart and Krusell (J Polit Econ 128(1):118–157, 2020) propose a new preference class in order to account for these observations. They show that the income effect on labor supply exceeds the substitution effect in the balanced-growth path. However, the longer-term changes, or less-developed economies, reveal backward-bending relationships between income and working hours. To explain this fact, we introduce Stone–Geary type non-homotheticity in preferences into a non-overlapping generations model, and analyze how working hours evolve with income. With the non-homotheticity, the long-run equilibrium labor supply bends backward. Further, the backward-bending curve emerges not only as a transitional phenomenon, but also in the balanced-growth path.

在大多数发达经济体中，工作时间稳步下降，而人均收入却稳步增长。Boppart和Krusell（J Polit Econ 128（1）：118-157，2020）提出了一个新的偏好类别，以解释这些观察结果。他们表明，对劳动力供给的收入效应超过了均衡增长路径中的替代效应。但是，长期变化或经济欠发达揭示了收入与工作时间之间的倒退关系。为了解释这一事实，我们将偏好的Stone–Geary类型非均等性引入到不重叠的世代模型中，并分析了工作时间如何随着收入而变化。由于非均质性，长期的均衡劳动力供给向后弯曲。此外，向后弯曲曲线不仅以过渡现象出现，