Without one, there cannot be the other. There is no "baseline" emotion, happiness and sadness are just relative to one another.

Does the absence of happiness equal sadness? Not in my opinion. Can there be depression within joy within fear within contentment? Absolutely. Emotions, I feel, cannot be measured (or even estimated) in the way you are asking about.
TurnyBright Reviewed by TurnyBright on . Do you think theres more depression or happiness in the world? If you were to take the cumulative emotions of everyone on this planet would you say this a happy or a sad world in grand generality. If one were to sum up the suffering of many but also take into account the people happy with their simple lives and those miserable in their extravagent ones. Which and why amigo?:):( Rating: 5