Consider personal computers. The demand for computers have increased over time due to the advance in information technology, which makes a computer more of a necessity rather than a luxury as it was 20 years ago. In other words, at any given price, more people are willing to purchase computers than before. Hence, the demand curve shifts to the right.

The production of personal computers have also experienced drastic changes, driven by advance in manufacturing technology such as the use of robots. The advance in production technology reduces the cost of producing computers, which allows firms to produce more at a given price level of computers. Thus the advance in production technology shifts the supply curve to the right.