What we do to help others is useful. It is useful to create and distribute the wealth we all need, to teach others, and to cure the sick. What we do to harm others, or to produce no useful result, is us useless. It is useless to work as bureaucrats, to take part in government, or to fight in wars. Useful labour produces useful wealth and service, and useless labour produces useless wealth and service.
Wealth can be a necessity or a luxury.
Necessities are adequate water, beverages, food, clothes, and housing. Luxuries are the extra items, such as televisions, fine clothes, comfortable transport, and objects of art. Both necessities and luxuries are us useful wealth, although no one should have the latter until everyone has the former. Most people imagine that it would take an impossible utopia to give everyone the necessities of life. Recently, however, a factor has been added to society that makes it possible.