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The article Supply, Not Demand, to Blame for Pullback in May Home Sales addressed the issue of a lack of supply being the cause for the recent decline in house sales. In May, 1.5% of sales had fallen and the decline of properties is usually associated with the lack of demand. However recently, demand has been exceeding supply. A lack of supply leads to a left shift of a supply curve (price of houses and supply of properties) as there is a decrease in supply. The determinant of this shift is caused by productivity. Productivity is the input vs. the output; firms wish to minimize input to gain the greatest output. In this case, productivity has decreased as the input is not being met to meet the maximum output therefore leading to a lack of supply. It also relates to the basic economic problem of scarcity and that the resource (houses) is scarcer than before which affects the production therefor the supply of the good. However economists predict an increase in the supply of goods, despite these recent developments. Perhaps this lack of supply, this left shift of the supply curve was caused by a supply shock.