Statics is the action of one body on another. A force is either a push or a pull. A force tends to move a body in the direction of its action. The action of a force is characterized by its magnitude, by the direction of its action, and by its point of application. Thus, force is a vector quantity, because its effect depends on the direction as well as on the magnitude of the action. Forces are classified as either contact or body forces. A contact force is produced by direct physical contact; an example is the force exerted on a
AD–AS model raw materials. These factors shift short-run curves "exclusively". Changes in the quantity and quality of labour and capital affect both long-run and short-run supply curves. A greater quantity of labour or capital corresponds to a lower price for both. A greater quality in labour or capital corresponds to a greater output per worker or machine. The long-run aggregate supply curve of the classical model is affected by events that affect the potential output of the economy. Factors revolve around changes in the quality and quantity of factors of production. Keynesian Case: If there is a fiscal expansion i.e. there is