There is certainly more to living a quality and fulfilled life than merely a decent income – we also need, for example, healthy and quality relationships or satisfactory environments to live in.
Nevertheless, the material aspect plays a central role in contemporary society and can also have even an indirect effect on those previously mentioned attributes of a quality life – when, for example, due to financial straits, there is no money left for healthy food or preventative healthcare or even when partners fight due to limited family funds.
We are not trying to define what a decent life is with a minimum decent wage; rather, we are drawing attention to the amount of material security that is needed for a person to feel like they are on equal footing in society.