In their book Happiness: Unlocking the Mysteries of Psychological Wealth, father and son Ed Diener and Robert Biswas-Diener put pay early on to the myth that you need to be a monetary millionaire to be wealthy. True wealth, according to them, is instead a healthy, well-balanced combination of several elements:

• Life satisfaction and happiness

• Spirituality and meaning in life

• Positive attitudes and emotions

• Loving social relationships

• Engaging activities and work

• Values and life goals to achieve them

• Physical and mental health

• Material sufficiency to meet our needs

Priceless.