Microeconomics cases of supply and demand

Microeconomics cases of supply and demand Increase in Demand only - Price up, Quantity up Decrease in Demand only - Price down, Quantity down Increase in Supply only - Price down, Quantity Up (LoD) Increase in both Supply and Demand - Price is ambiguous and Quantity goes up Decrease in Demand and increase in Supply - If they are moving opposite then Q is ambiguous and Price follows demand so Price down and Quantity is am biguous Decrease in Supply only - Price up, Quantity down (LoD) Increase in Demand decrease in Supply - If they are moving opposite then Q is ambiguous and Price follows demand so Price goes up Quantity is ambiguous Decrease in both Supply and Demand - If both are moving in the same direction Price is ambiguous and Quantity follows both P and Q move in the same direction when - Demand only moves P and Q move in opposite directions when - Supply only moves, Quantity follow supply Price is ambiguous when - both S and D move in the same direction Quantity is Ambiguous when - both S and D move in opposite directions If both S and D are moving in the same direction how do you know which way Q moves? - Q moves in the sa me direction as both If both are moving in opposite direction, which way does price move? - P follows demand find y intercept for Qd quickly - if Qd = a - bP divide a by b for example if Qd = 1000 - 5P then intercept is 1000/5 find y intercept for Qs q uickly - if Qs = cP - d, divide d by the co -efficient of P for example if Qs = 4p - 80 then y intercept is 80/4 finding D and S y -intercept rule - always divide the constant by the co -efficient of P