Its existence depends on the mind, heart, attitudes, and devotion of the person. It concerns internal conditions, not external criteria. Two people can have the same income, standard of living, amount of savings, possessions, retirement plan, and benefits. Yet, it is possible for one to be materialistic and the other not. Materialism is an attitude.
Materialism is a perspective.
Everything real exists in this world and this life. Only real, 'this world' things provide human security. The poor have no security. Wealth provides power, opportunity, and the means to create your own security. Poverty makes you powerless.