Authors advocate the Bayesian shrinkage estimator as their headline; obs 2021 is the shrinkage-average SR price elasticity (-0.158). || 'Shrinkage estimators gave more reasonable results.' (abstract, p.90); shrinkage 'produces a tighter and more sensible range' (p.96).
Maddala, G. S., R. Trost, F. Joutz and H. Li (1997): “Estimation of Short Run and Long Run Elasticities of Energy Demand from Panel Data Using Shrinkage Estimators.” Journal of Business and Economic Statistics 15(1), 90-100