When you decided to obtain a DVD for your science fiction assignment in Module 4, where did you go to find a movie based on a Philip K. Dick book? Did you rent or purchase a DVD, or did you view it digitally on your computer using Netflix or a similar vendor of video-on-demand? 

 I chose to watch  A Scanner Darkly using Amazon Prime. This Amazon Prime service and Netflix were the only places I knew I could watch one of the movies very cheaply and find the movie easily.  In my community the only movie rental  store has been Blockbuster and it is in the process of closing.  Redbox is also available as a cheap rental place, but always finding the movie you want is not easy. With Amazon Prime I had the movie started within minutes and I never had to leave my home.

Is the current competition between DVDs and video-on-demand an example of increasing returns or Red Queens?
The video on demand and DVDs are an example of Red Queens. Both share the same market, but the video on demand makes it easier for the consumer to have the movie they want right then.  I don't have to worry if the last copy is rented because with on demand it is always available. Even the DVDs rental company Redbox now has video streaming available to stay in the market of both areas.

Where do you think DVDs and video-on-demand are on the four criteria of McLuhan's tetrad? 

DVDs are being replaced and becoming obsolete by the video on demand services.  The convenience that having the exact video you want streamed to your television, computer, or other electronic device is something consumers want.  I think the on demand enhances YouTube where people have been downloading how to, funny, and entertaining videos for the past several years.