People all over the world start discovering that they have the power to place Curses on other individuals. To Curse another individual, all a person has to do is visualise the person's face (to a sufficient degree of clarity) in their head, and say out loud "Curse [the person's name]" three consecutive times. For the purposes of the Curse, the name uttered can be any one of many names the person uses so long as it is a name that he/she has used in the past (so it doesn't have to be their passport name or actual birth name); it is also sufficient to just say a first name for example. This makes it relatively easy for any one person to place a curse on someone they dislike, bear a grudge against, or believe the world would be better off without.
To be specific, there is only one Curse that an individual can place on another using the above method. A given individual can Curse as many people as they want to (theoretically). If someone is already Cursed and gets Cursed again, nothing happens as a result of the second Curse but the first Curse will continue to operate.
If someone is afflicted by a Curse, they will be be hit by a fatal in-curable supernatural illness that ends in death. The Curse has three stages:
Stage 1: the person becomes paralysed from waist down...
Stage 2: the person experiences extremely high fevers, nausea, dizziness, vomiting, episodes of tremors...
Stage 3: Sudden heart attack and death.
Typically it would take anywhere from 1 week to a full month for a person who has been Cursed to completely die depending on a variety of factors related to the individual's health and stamina.
...
So then what happens now? Please speculate.
Let's discuss this.
The world exists as it does now. STARTING TOMORROW, people start realising that this power exists and at least some people start to place Curses on other people. What happens next (socially, politically, economically)?