We're approaching the technological capability to build digital interfaces to the brain. A future government body introducing a new mandate that leverages these devices to somehow guarantees justice and harmony amongst humans. The mandate proposes that it reads the "value" of an individual, a hypothetical measure ranging from -10 to 10 that represents his suffering or pleasure. However, it modifies his perception of his value to be that of the average of all humans value. Once put in place, no human can control this system, and will gradually take effect over a month. It will also be inherited by children.
Assuming the government has found a way to guarantee the participation of all humans, what could possibly go wrong?
Each person's subjective experience of suffering to pleasure ranged on a scale -10 to 10, called the "value".
Each person experiences the average of everyone's old world value.
Note: The average value that everyone experiences is gradually scaled up if it consistently remains near zero and is gradually scaled down if it is fluctuating for too long. This is similar to how the effects of recreational drugs go down with regular use and return when not used for long enough.