Name those goods that today can play the role of a universal equivalent?

For a long time, precious metals have played an important role in the economy. Gold and silver now play a very large role in the market and can be used as an equivalent. But I believe the future is electronic invoices and retinal prints.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.