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Labour equilibrium wage

Assume that aggregate demand curve can be expressed by the following function: W = 55 – 3Q, while the aggregate supply curve can be expressed by the following function: W = 5+7Q. Here W denotes wage level in thousand dollar and Q denotes unit of labours in million people.
a. What is labour equilibrium wage level and units of labour?
b. Draw the demand curve and supply curve in one diagram.
c. Explain three factors to result in shift of demand curve and three factors to result in shift of supply curve in detail.
d. Suppose engineering industry experienced large demand of product and thus hiring lots of people in labour market; however, there are no sufficient amount of labour force in the market. Please explain how will market respond to this labour shortage in short run and long run by applying Cobweb Model. (The combination of words and diagram will be preferable.)