Q: Define: 1) Inferior Good and 2) Compliments

A:  Inferior Good:  A good which a person demands less as income increase. 
                                            or
                             As I increases Qx decreases. 
                                            or
                             The income elasticity is negative.

     Compliments:  Two goods are compliments if an increase in the price of one
                            good causes less of the other good to be demanded.
                                            or
                            As Py increases Qx decreases.
                                            or
                            The cross price elasticity is negative.