A movement in a supply curve is a change in supply as a result of a change in price In the example above an increase in price is reflected by a movement along the supply curve causing more to be supplied. A shift in a supply curve is a change in supply for a reason other than a change in price. In the illustration the supply curve has shifted to the right. This means that more is supplied at every price. I f the price was 5 Euros the quantity supplied has increased from 10 to 25. There could be any of four reasons Reduction in average costs of production Subsidy on raw materials Subsidy on labour Improvements in technology A shift to the left in which less will be supplied at every price could be caused by Increase in average cost of production Taxation of raw materials A switch in production to a more lucrative option A declin in demand for the product