Cell phones and computers operate in a similar manner. Most drinks and a lot poor people food is synthetic/soy compounds- a la soykaf for coffee and foods and such. Cuts of fresh beef is a luxury. Money is mostly digital, carried in credsticks -  the size of a USB drive. They come in secured and unsecured forms. 

Secured credsticks are tied to a person's ID number, secure but unusable to those without it. Unsecured credsticks are like reloadable prepaid cards. They can he loaded up with money and whoever holds the  stick has access to the funds.