A stackable shopping cart has a rolling frame, a basket, a pushing device, and a wall that can be swiveled into the inside of the basket, through which wall the back of the basket can be closed, whereby two upwardly directed carriers are positioned on the back end of the rolling frame, and the basket is provided at its back with support elements that form a push-on connection with the carriers. This method was optimized using homogenous populations of naive T cells purified from mice transgenic for the 2C T cell receptor. In other words, a customer pays to own the item without acquiring possession of the item. In a method for producing a magnetic garnet single-crystal film by growing a Bi-substituted magnetic garnet single crystal in a mode of liquid-phase epitaxial growth, the lattice constant of the growing magnetic garnet single crystal is so controlled that it does not vary or gradually decreases with the growth of the single-crystal film, and then increases with it. A system for monitoring patient medicine intake compliance includes a monitoring device placed within communicative proximity of ingestible dosage forms to transmit the wireless excitation signal and receive the wireless response signal including pill identifying information from the ingestible dosage forms.