A system, apparatus and method utilize a micro electronic device implanted in a person or group of persons, or wearable thereby, to manage a variety of activities, including checking out a product or service from a market, such as a micro-market. The method includes the steps of providing a RF microdevice having an electronic identification code and attaching the microdevice to the user. A checkout system is provided including an RF reader and a processor. The user brings the microdevice near the reader, whereby the reader communicates with the microdevice via RF signals, and the RF reader signals the processor to corroborate the identification code. If the processor corroborates the identification code, the processor signals that a successful product or service checkout has occurred. If the processor does not corroborate the identification code, a checkout is not confirmed.