The kind of lighting you choose will be a huge factor in the cost of lighting installation. Simple lighting can be pretty affordable, but more expensive fixtures will bring up the cost of installation-as will antique chandeliers or fixtures.
a change in supply is the shift in supply curve due to change in price of other commodities and other factors like taste,weather,income e.t.c while a change in quantity supply â¦ is the change in price of the commodity itself that affect the quantity supply,here the supply curve remain constant but there will be a movement along the supply curve.
On the other hand, change in demand refers to increase or decrease in demand of a product due to various determinants of demand, while keeping price at constant. Changes in quantity demanded can be measured by the movement of demand curve, while changes in demand are measured by shifts in demand curve. The terms, change in quantity demanded refers to expansion or contraction of demand, while change in demand means increase or decrease in demand. 1. Expansion and Contraction of Demand: The variations in the quantities demanded of a product with change in its price, while other factors are at constant, are termed as expansion or contraction of demand. Expansion of demand refers to the period when quantity demanded is more because of the fall in prices of a product.