Boussemart et al. (2009, 2010, 2018) propose to identify a global α-returns to scale that allows to minimise the inefficiency of the production set. This paper extends this notion to the concept of specific α-returns to scale. In such case, it is possible to identify the impact of each input...

Charnes et al. (1982, 1983) introduced a multiplicative model for efficiency measurement under Data Envelopment Analysis (DEA) framework. Later, Coelli and Peyrach (2009) presented the Multiplicative Directional Distance Function which was recovered by Mehdiloozad et al. (2014) to draw the...