Time to learn you spitty:
Taken from
http://en.wikipedia.org/wiki/Supply_and_demand
The four basic laws of supply and demand are:[1]
If demand increases and supply remains unchanged, a shortage altogether, thus leads to a higher equilibrium price.
If demand decreases and supply remains unchanged, a surplus altogether, thus leads to a lower equilibrium price.
If demand remains unchanged and supply increases, a surplus altogether, thus leads to a lower equilibrium price.
If demand remains unchanged and supply decreases, a shortage altogether, thus leads to a higher equilibrium price.