Zero

I have a theory that if you add up all the good things and all the bad things in the universe it adds up to zero. I apply this to many things, but mainly for luck and emotion. The amount of good luck and bad luck that an individual has over their lifetime should add up to zero in the end, as probability would suggest. Therefore, you shouldn't be disappointed when you experience something that is unlucky, because it just means that you will experience an equal amount of good luck in the future. For emotion the amount of happiness (aka positive emotions) a person has is equal to the amount of pain (aka negative emotion) they experience in their lifetime. This happens because of how we adjust to our surroundings. If we become used to something good happening then its happiness strength is less. This also makes it so that if something bad happens instead, the strength of that negative feeling is stronger to counterbalance.

If emotion does add up to zero then it would help to prove an additional theory of mine. I believe that people who use drugs, injecting happiness artificially, will experience an additional amount of negative emotion as the scales of emotion are forced to counterbalance leaving with a net total of the same amount of total pleasure and pain. So if you chose to use drugs you are just deciding to have larger swings of emotion rather than a more constant an moderate level. As a person who usually doesn't have a very large swing of emotion it is one of my reasons to use as I am often jealous of people who experience larger ranges of emotion as I feel it is a better way to live life.