The SLUTSKY equation provides insight into the own price effect (p1). But more specifically, it allows us to understand why the demand curve does not always slope downwards (i.e.: why it doesn't always have a (-) sign); and also why the change in price can have an impact on the consumption of other goods. We aim to DECOMPOSE the slutsky equation into two parts that allow us to understand the total effect of a price change. The total effect is constituted by the Substitution Effect (SE) and the Income Effect (IE). The first decomposition is the SE, and the second decomposition is the IE.