For a normal good the right side is negative. For Giffen goods it is positive.
For a normal good the right side is negative. For Giffen goods it is positive. The right hand side has two terms that display the effect of the changing price, the resulting calculation of which gives the slope of the Marshallian Demand Curve. FTP, name this equation important in Microeconomic analysis that breaks total observed effect on demand due to a price change into substitution and income effects, named for a Russian Economist.
For a normal good the right side is negative. For Giffen goods it is positive.
The Slutsky Equation