What is the fine-grained topic of the following text: Interestingly, in the presentation Google said that given the decrease in price of television screens and the low cost of the Chromebit it may turn out that it would be the same to print a 42" ads to hang in a shop or to hang a video screen and display images with Chromebit! Only return the topic.
The cost-effectiveness of using Chromebit and television screens for display advertising in shops.