The borderline between luxury and necessity

The boderline between luxury and necessity seemed to be clearer in the past.
The demarcation lied between "must" and "want."
Today, however, to define the clear borderline seems more complicated
because our living condition has dramatically changed for the last decades.
I would like to talk about how the boerderline has changed by using
following point.

Some of goods have been rapidly transformed in the public’s eyes from luxury toward necessity. Let’s take air conditioner for example. According to one statistics, air conditioner is now considered necessity by seven-in-ten adults up from 50% in 1996. The other day, two tragic deaths hit Japan. One 84 year old female living without any air conditioner died from heat exhaustion/heat stroke. The other case is like this. One child left in a car without any air conditioner died from heat exhaustion too. Temperature in a car could reach at 50 or 60 degree on hot summer day. To prevent them, especially vulnerable people against harsh condition such as the elderly and children from death, air conditioner is necessity for them. This is the equipment not only for comfortable but also for surviving.

In conclusion, the borderline between luxury and necessity is demarcation between “survive” and “die”. Goods seemingly categolized in luxury can become necessity owing to circumstance.