Source: Alfred Marshall quote, Principles of Economics (1895 edition) Book III, Chapter IV, paragraph III.VI.17 http://www.econlib.org/library/Marshall/marP14.html#Bk.III,Ch.VI
Goods for which demand increases as income increases.
Goods for which demand decreases as income increases.
Veblen Goods (conspicuous consumption)
Goods for which consumption increases as income increases because consumers wish to establish stature and prestige.
A good for which the demand increases with price and falls as price decreases.
A good that offers better quality and features which is consumed when income rises.