A lot of people, and this includes everybody from philosophers and economists to ordinary people believe that human nature is fundamentally selfish, that we're only ever really motivated by our own welfare.
Mucha gente, esto atañe a todos desde filósofos y economistas hasta la gente común, cree que la naturaleza humana es fundamentalmente egoísta, que solo estamos realmente motivados por nuestro propio bienestar.