an economic theory that states that the price of a good or service is determined by the availability of the product (supply) and the demand for it
商品やサービスの価格は、商品の供給（供給量）とその需要によって決定されるという経済学の理論 (shouhin ya sa-bisu no kakaku wa, shouhin no koukyuu (koukyuuryou) to sono juuyou ni yotte kettei sareru to iu keizaigaku no rironn)
"The law of supply and demand dictates that prices will rise if demand outstrips supply."
"需要が供給を上回ると、供給と需要の法則によって価格が上昇します。" (juuyou ga koukyuu o uwamawaru to, **koukyuu to juuyou no housoku** ni yotte kakaku ga joushou shimasu)
to speak at length in an excited or annoyed way
to act in a manipulative or strategic way to gain advantage
to do something without knowing the outcome
to model the behavior you expect from others
assistance or support
to eat something quickly
