The classic economic phrase that we all learn when we go to economics class is "oferta y demanda". So, how can we translate this properly? The big temptation is to use "offer and demand" but this is the Spanglish approach which should be avoided if possible.
A much better option would be "supply and demand". So, for example: "It is a classic case of supply and demand" or "When supply is low then demand is high".
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.