(market) , (), (supply) (demand) . . . , , , . - , . , , , , , , (, ).
: , . (inelastic supply of labor) , , .
(monopolistically competitive industry) , , , . (product differentiation) .
(income elasticity of demand) . 1 ( ), (luxury good); 1, (necessity)( ). , . ( (inferior goods), , (staple foods), , , , . , (normal good).