Recently launched Modstream creates text advertising on shopping carts. Via their website, advertisers create messages, select stores, days, day-parts and pay for their campaign. The system works through internet and wifi to deliver messages to the trolleys.

Nice enough, but it’s missing a critical element. Where’s the RFID or Bluetooth signal? With that, the trolley would deliver timely promotional messages in the right aisle. It needs a new level of infrastructure both in terms of hardware and in store management. But I’m sure it’s what clients will be demanding.