“…Studies on the bank market power use different methods such as OLS regression, panel data with fixed effects (FE) or random effects (RE), and GMM (Ahmed & Hla, 2019; Alexiou, Vogiazas, & Nellis, 2018; Almaqtari, Al‐Homaidi, Tabash, & Farhan, 2019; Amidu & Wolfe, 2013; Cheuathonghua & Padungsaksawasdi, 2019; Jiménez, Lopez, & Saurina, 2013; Labidi & Mensi, 2015; Soedarmono et al, 2011). On the other hand, the QR method is more robust to outliers (Feng & Huang, 2020; Lyon & Olmo, 2018; Oliveira, Tabak, de Lara Resende, & Cajueiro, 2013) and thus more appropriate for the analysis of the interest margin, as it considers the conditional distribution of the regressor (dependent variable), which in our case is not homogeneous 1 and has an increasing hetero trend.…”