Answer:
Both demand and supply curve will shift
Step-by-step explanation:
Owing to technological advancement i.e new equipment in manufacturing facilities, more Blu-ray will be manufactured due to which the supply of bluray form in the market will increase, shifting the supply curve to the right.
At the same time, DVDs and VHSs are getting less popular owing to which, the demand for Bluray , being a substitute for those shall increase.This would lead to demand curve for Blu-ray shifting to the right.
Thus, such a scenario as described will cause a shift in both demand and supply for Blu-ray movies.