1. Aggregate supply function is an increasing function of the level of employment. 

2. Aggregate supply refers to the value of total output of goods and services produced in an economy in a year. 

3. In other words, aggregate supply is equal to the value of national product, i.e., national income. 

4. Aggregate Supply = C + S + T + Rf =Aggregate income generated in the economy.

5. The following figure shows the shape of the two aggregate supply curves drawn for the assumption of fixed money wages and variable wages.

Aggregate Supply Curve

1. Z curve is linear where money wages remains fixed; Z₁ curve is non – linear since wage rate increases with employment. 

2. When full employment level of Nf is reached it is impossible to increase output by employing more men.

3. So aggregate supply curve becomes inelastic (Vertical straight line). 

4. The slope of the aggregate supply curve depends on the relation between the employment and productivity. 

5. Based upon this relation, the aggregate supply curve can be expected to slope upwards. 

6. In reality the aggregate supply curve will be like Z₁

7. Therefore, the aggregate supply depends on the relationship between price and wages.