In being concerned about the Blu-Ray players and only adopting them late, Stef and Garth can be classified as part of the Late Majority diffusion of innovation group.
The Diffusion of Innovation Theory posits that there are different stages to adopting new technology such as:
Stef and Garth are therefore part of the late majority because they only got the disc players after they were out of fashion because they had initial skepticism.
In conclusion, Stef and Garth are part of the late majority.
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