Abstract
Caves, Christensen and Diewert proposed a method for estimating a theoretical productivity index for a firm using Törnqvist input and output indexes, augmented by exogenous estimates of local returns to scale. However, in order to implement their method, they assumed that the firm maximized revenue in each period, conditional on the observed input vector in each period, taking output prices as fixed. This assumption is not warranted when there are increasing returns to scale. Thus in the present paper, it is assumed that the firm solves a monopolistic profit maximization problem when there are increasing returns to scale and the results of Caves, Christensen and Diewert are modified in accordance with this assumption.
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Diewert, W.E., Fox, K.J. Malmquist and Törnqvist productivity indexes: returns to scale and technical progress with imperfect competition. J Econ 101, 73–95 (2010). https://doi.org/10.1007/s00712-010-0137-0
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DOI: https://doi.org/10.1007/s00712-010-0137-0
Keywords
- Productivity
- Index numbers
- Malmquist indexes
- Törnqvist indexes
- Returns to scale
- Non-competitive behavior
- Flexible functional forms