Figure 3-8 
-Refer to Figure 3-8.The graph in this figure illustrates an initial competitive equilibrium in the market for apples at the intersection of D1 and S1 (point A) .If the price of oranges,a substitute for apples,decreases and the wages of apple workers increase,how will the equilibrium point change?
Definitions:
Aquifers
Underground layers of water-bearing rock or materials that can yield water for use.
Guano
The accumulated excrement of seabirds or bats, used historically as a highly effective fertilizer because of its high nitrogen, phosphate, and potassium content.
Limestone
A sedimentary rock composed mainly of calcium carbonate, often used in construction and as a raw material in cement production.
Aquifer
An underground layer of water-bearing permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted using a water well.
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