Explain what factors could cause the price of milk to rise?
Just basic stuff that would increase demand
An increase in population means more people buying milk An increase in income (if the good is normal yed) A fall in demand substitute to milk Lower income tax meaning higher disposable income An increase in consumer tastes for milk Inflation
All of these will raise price of milk, all but the last one (inflation) will increase demand shifting the demand curve to the right and as a result increasing price.