The opposite can be true; i.e., people with large muscle mass sometimes have elevated CK levels in the absence of any pathology. This particular enzyme falls into a category where an individual's own normal is more relevant than the normal range given for a population.
1 If the demand increases, and the supply remains the same, there will be a shortage. 2  This will mean the price will increase. 3  If the demand decreases, and the supply remains the same, there will be a surplus. 4  This will mean the price will go down.
When law of demand is operational, there is movement along the demand curve. For example, if the price of DVDs increase, the demand will fall. If there is change in any other factor of demand (listed above) then there is a shift in demand curve. For example, if people stops preferring dvds then its demand will fall.