The inductive effect can be used to determine the stability of a molecule depending on the charge present on the atom and the groups bonded to the atom. For example, if an atom has a positive charge and is attached to a -I group its charge becomes amplified and the molecule becomes more unstable. Similarly, if an atom has a negative charge and is attached to a +I group its charge becomes amplified and the molecule becomes more unstable. In contrast, if an atom has a negative charge and is attached to a -I group its charge becomes de-amplified and the molecule becomes more  stable than if the I-effect was not taken into consideration. Similarly, if an atom has a positive charge and is attached to a +I group its charge becomes de-amplified and the molecule becomes more stable than if the I-effect was not taken into consideration. The explanation for the above is given by the fact that more charge on an atom decreases stability and less charge on an atom increases stability.