Despite the assumption about the positive relationship between wellbeing and performance within the happy and productive worker thesis (HPWT). the matter is still under discussion due to inconclusive results. To better understand the link between wellbeing and performance and delineate their possible causal relationships. it is necessary to conduct longitudinal studies with data colle... https://www.roneverhart.com/Martin-000-15SM-15-Series-12-Fret-Acoustic-Guitar-p19001/