I Study economics independently at Marginal Revolution University. But I am stuck with few of the very first Concepts. Those are:

Demand and Supply curve Shifts in Isolation.

Demand Curve Shifts: When there is a population rise, then demand curve shifts up and to the right. Which implies there is a increase in price and quantity demanded of the product. Increase in Quantity demanded is logical because there are more number of people than before, But Why does per unit Price of the good Increase?

Supply Curve Shifts: When the input cost rises the supply curve shifts up and to the left. Which implies that there is an increase in price and decrease in quantity Supplied. Increase in price is obvious because it is expensive to produce an unit than before, but why does the Quantity supplied decrease? If your answer is that with lower profits producers are motivated to produce less than before, aggregate profit would be more in latter case than former.

Please answer, Thanks in Advance.

I Study economics independently at Marginal Revolution University. But I am stuck with few of the very first Concepts. Those are:

Demand and Supply curve Shifts in Isolation.

Demand Curve Shifts: When there is a population rise, then demand curve shifts up and to the right. Which implies there is a increase in price and quantity demanded of the product. Increase in Quantity demanded is logical because there are more number of people than before, But Why does per unit Price of the good Increase?

Supply Curve Shifts: When the input cost rises the supply curve shifts up and to the left. Which implies that there is an increase in price and decrease in quantity Supplied. Increase in price is obvious because it is expensive to produce an unit than before, but why does the Quantity supplied decrease? If your answer is that with lower profits producers are motivated to produce less than before, aggregate profit would be more in latter case than former.